Methods in structs
📖 Scenario: Imagine you are creating a simple app to keep track of books in a small library. Each book has a title and an author. You want to add a feature that shows a short description of the book using a method inside a struct.
🎯 Goal: You will create a Book struct with properties for the title and author. Then, you will add a method inside the struct that returns a description string combining the title and author. Finally, you will create a book instance and print its description.
📋 What You'll Learn
Create a struct called
Book with two String properties: title and author.Add a method called by <author>".</div><div class="project-req-item">Create an instance of <code>Book</code> with the title "The Swift Journey" and author "Alex Developer".</div><div class="project-req-item">Print the result of calling the <code>description()</code> method on the book instance.</div></div></div></div><div class="project-faq-item"><div class="project-faq-header"><span class="project-faq-title">💡 Why This Matters</span><svg class="project-faq-icon" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><polyline points="6 9 12 15 18 9"></polyline></svg></div><div class="project-faq-body"><div class="project-context-grid"><div class="project-context-item"><div class="project-context-label">🌍 Real World</div><div class="project-context-value">Structs with methods are used to model real-world objects and their behaviors in apps, like books in a library app.</div></div><div class="project-context-item job"><div class="project-context-label">💼 Career</div><div class="project-context-value">Understanding how to add methods to structs is important for writing clean, organized Swift code in iOS app development.</div></div></div></div></div></div><div class="project-progress"><div class="project-progress-label"><span>Progress</span><span>0<!-- --> / <!-- -->4<!-- --> steps</span></div><div class="project-progress-bar"><div class="project-progress-fill" style="width:0%"></div></div></div><div class="project-step-nav"><button class="project-step-btn active ">1</button><button class="project-step-btn ">2</button><button class="project-step-btn ">3</button><button class="project-step-btn ">4</button></div></div></article><article class="content-card project-step-container active"><div class="code-articles-card-body "><div class="project-step-header d-flex align-items-center"><div class="project-step-badge ">1</div><div class="project-step-title-wrap "><div class="project-step-title">Create the Book struct with properties</div></div></div><div class="project-instruction">Create a struct called <code>Book</code> with two <code>String</code> properties named <code>title</code> and <code>author</code>.</div><div class="project-code-editor"><div class="code-editor-header"><span class="code-editor-label"><svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M16 18l6-6-6-6"></path><path d="M8 6l-6 6 6 6"></path></svg>Swift</span><div class="code-editor-actions"><button class="code-reset-btn">↺ Reset</button><button class="code-solution-btn"><span class="new-material-symbols icon-hw-22 me-1"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 -960 960 960" fill="#d97706"><path d="M602.83-377.25q50.5-50.57 50.5-122.83 0-72.25-50.58-122.75-50.57-50.5-122.83-50.5-72.25 0-122.75 50.58-50.5 50.57-50.5 122.83 0 72.25 50.58 122.75 50.57 50.5 122.83 50.5 72.25 0 122.75-50.58ZM401.5-421.66q-32.17-32.32-32.17-78.5 0-46.17 32.33-78.34 32.32-32.17 78.5-32.17 46.17 0 78.34 32.33 32.17 32.32 32.17 78.5 0 46.17-32.33 78.34-32.32 32.17-78.5 32.17-46.17 0-78.34-32.33ZM234.83-274.67q-110.5-74.66-176.5-192.66-4.33-7.75-6.5-15.93-2.16-8.18-2.16-16.8 0-8.61 2.16-16.75 2.17-8.14 6.5-15.86 66-118 176.5-192.66Q345.33-800 480-800t245.17 74.67q110.5 74.66 176.5 192.66 4.33 7.75 6.5 15.93 2.16 8.18 2.16 16.8 0 8.61-2.16 16.75-2.17 8.14-6.5 15.86-66 118-176.5 192.66Q614.67-200 480-200t-245.17-74.67Z"></path></svg></span>Show Code</button></div></div><textarea class="project-code-textarea" spellCheck="false"># Create the Book struct with title and author properties
# Your code here</textarea></div><button class="run-code-btn project-run-btn"><svg viewBox="0 0 24 24" fill="currentColor"><polygon points="5 3 19 12 5 21 5 3"></polygon></svg>Run Code</button><div class="project-hint "><div class="hint-toggle-btn"><span class="new-material-symbols icon-hw-24"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 -960 960 960" fill="#d97706"><path d="M480-80q-26.67 0-47.33-12.83Q412-105.67 404-128h-9.33q-27 0-46.84-19.83Q328-167.67 328-194.67v-142.66Q264.33-379 227.17-445 190-511 190-590q0-121 84.5-205.5T480-880q121 0 205.5 84.5T770-590q0 79.67-37.17 145.33Q695.67-379 632-337.33v142.66q0 27-19.83 46.84Q592.33-128 565.33-128H556q-8 22.33-28.67 35.17Q506.67-80 480-80Zm-85.33-114.67h170.66V-236H394.67v41.33Zm0-81.33h170.66v-39.33H394.67V-276Zm110.66-106v-127.33L579-583q7.67-7.67 7.33-17.33-.33-9.67-8-17.34-7.66-7.66-17-7.66-9.33 0-17 7.66L480-553.33l-64.33-64.34q-7.67-7.66-17-7.33-9.34.33-17 8-7.67 7.67-7.67 17t7.67 17l73 73.67V-382h50.66Z"></path></svg></span>Need a hint?</div><div class="hint-content"><p>Use <code>struct Book { }</code> and inside it declare <code>var title: String</code> and <code>var author: String</code>.</p></div></div></div></article><article class="content-card project-step-container "><div class="code-articles-card-body "><div class="project-step-header d-flex align-items-center"><div class="project-step-badge ">2</div><div class="project-step-title-wrap "><div class="project-step-title">Add a description() method to the Book struct</div></div></div><div class="project-instruction">Inside the <code>Book</code> struct, add a method called <code>description()</code> that returns a <code>String</code> combining the <code>title</code> and <code>author</code> in the format: "<title> by <author>".</div><div class="project-code-editor"><div class="code-editor-header"><span class="code-editor-label"><svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M16 18l6-6-6-6"></path><path d="M8 6l-6 6 6 6"></path></svg>Swift</span><div class="code-editor-actions"><button class="code-reset-btn">↺ Reset</button><button class="code-solution-btn"><span class="new-material-symbols icon-hw-22 me-1"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 -960 960 960" fill="#d97706"><path d="M602.83-377.25q50.5-50.57 50.5-122.83 0-72.25-50.58-122.75-50.57-50.5-122.83-50.5-72.25 0-122.75 50.58-50.5 50.57-50.5 122.83 0 72.25 50.58 122.75 50.57 50.5 122.83 50.5 72.25 0 122.75-50.58ZM401.5-421.66q-32.17-32.32-32.17-78.5 0-46.17 32.33-78.34 32.32-32.17 78.5-32.17 46.17 0 78.34 32.33 32.17 32.32 32.17 78.5 0 46.17-32.33 78.34-32.32 32.17-78.5 32.17-46.17 0-78.34-32.33ZM234.83-274.67q-110.5-74.66-176.5-192.66-4.33-7.75-6.5-15.93-2.16-8.18-2.16-16.8 0-8.61 2.16-16.75 2.17-8.14 6.5-15.86 66-118 176.5-192.66Q345.33-800 480-800t245.17 74.67q110.5 74.66 176.5 192.66 4.33 7.75 6.5 15.93 2.16 8.18 2.16 16.8 0 8.61-2.16 16.75-2.17 8.14-6.5 15.86-66 118-176.5 192.66Q614.67-200 480-200t-245.17-74.67Z"></path></svg></span>Show Code</button></div></div><textarea class="project-code-textarea" spellCheck="false">struct Book {
var title: String
var author: String
// Add the description() method below
// Your code here
}</textarea></div><button class="run-code-btn project-run-btn"><svg viewBox="0 0 24 24" fill="currentColor"><polygon points="5 3 19 12 5 21 5 3"></polygon></svg>Run Code</button><div class="project-hint "><div class="hint-toggle-btn"><span class="new-material-symbols icon-hw-24"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 -960 960 960" fill="#d97706"><path d="M480-80q-26.67 0-47.33-12.83Q412-105.67 404-128h-9.33q-27 0-46.84-19.83Q328-167.67 328-194.67v-142.66Q264.33-379 227.17-445 190-511 190-590q0-121 84.5-205.5T480-880q121 0 205.5 84.5T770-590q0 79.67-37.17 145.33Q695.67-379 632-337.33v142.66q0 27-19.83 46.84Q592.33-128 565.33-128H556q-8 22.33-28.67 35.17Q506.67-80 480-80Zm-85.33-114.67h170.66V-236H394.67v41.33Zm0-81.33h170.66v-39.33H394.67V-276Zm110.66-106v-127.33L579-583q7.67-7.67 7.33-17.33-.33-9.67-8-17.34-7.66-7.66-17-7.66-9.33 0-17 7.66L480-553.33l-64.33-64.34q-7.67-7.66-17-7.33-9.34.33-17 8-7.67 7.67-7.67 17t7.67 17l73 73.67V-382h50.66Z"></path></svg></span>Need a hint?</div><div class="hint-content"><p>Define <code>func description() -> String</code> inside the struct and return the string using <code>"\(title) by \(author)"</code>.</p></div></div></div></article><article class="content-card project-step-container "><div class="code-articles-card-body "><div class="project-step-header d-flex align-items-center"><div class="project-step-badge ">3</div><div class="project-step-title-wrap "><div class="project-step-title">Create a Book instance</div></div></div><div class="project-instruction">Create a constant called <code>myBook</code> of type <code>Book</code> with the title set to <code>"The Swift Journey"</code> and the author set to <code>"Alex Developer"</code>.</div><div class="project-code-editor"><div class="code-editor-header"><span class="code-editor-label"><svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M16 18l6-6-6-6"></path><path d="M8 6l-6 6 6 6"></path></svg>Swift</span><div class="code-editor-actions"><button class="code-reset-btn">↺ Reset</button><button class="code-solution-btn"><span class="new-material-symbols icon-hw-22 me-1"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 -960 960 960" fill="#d97706"><path d="M602.83-377.25q50.5-50.57 50.5-122.83 0-72.25-50.58-122.75-50.57-50.5-122.83-50.5-72.25 0-122.75 50.58-50.5 50.57-50.5 122.83 0 72.25 50.58 122.75 50.57 50.5 122.83 50.5 72.25 0 122.75-50.58ZM401.5-421.66q-32.17-32.32-32.17-78.5 0-46.17 32.33-78.34 32.32-32.17 78.5-32.17 46.17 0 78.34 32.33 32.17 32.32 32.17 78.5 0 46.17-32.33 78.34-32.32 32.17-78.5 32.17-46.17 0-78.34-32.33ZM234.83-274.67q-110.5-74.66-176.5-192.66-4.33-7.75-6.5-15.93-2.16-8.18-2.16-16.8 0-8.61 2.16-16.75 2.17-8.14 6.5-15.86 66-118 176.5-192.66Q345.33-800 480-800t245.17 74.67q110.5 74.66 176.5 192.66 4.33 7.75 6.5 15.93 2.16 8.18 2.16 16.8 0 8.61-2.16 16.75-2.17 8.14-6.5 15.86-66 118-176.5 192.66Q614.67-200 480-200t-245.17-74.67Z"></path></svg></span>Show Code</button></div></div><textarea class="project-code-textarea" spellCheck="false">struct Book {
var title: String
var author: String
func description() -> String {
return "\(title) by \(author)"
}
}
// Create the myBook instance below
// Your code here</textarea></div><button class="run-code-btn project-run-btn"><svg viewBox="0 0 24 24" fill="currentColor"><polygon points="5 3 19 12 5 21 5 3"></polygon></svg>Run Code</button><div class="project-hint "><div class="hint-toggle-btn"><span class="new-material-symbols icon-hw-24"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 -960 960 960" fill="#d97706"><path d="M480-80q-26.67 0-47.33-12.83Q412-105.67 404-128h-9.33q-27 0-46.84-19.83Q328-167.67 328-194.67v-142.66Q264.33-379 227.17-445 190-511 190-590q0-121 84.5-205.5T480-880q121 0 205.5 84.5T770-590q0 79.67-37.17 145.33Q695.67-379 632-337.33v142.66q0 27-19.83 46.84Q592.33-128 565.33-128H556q-8 22.33-28.67 35.17Q506.67-80 480-80Zm-85.33-114.67h170.66V-236H394.67v41.33Zm0-81.33h170.66v-39.33H394.67V-276Zm110.66-106v-127.33L579-583q7.67-7.67 7.33-17.33-.33-9.67-8-17.34-7.66-7.66-17-7.66-9.33 0-17 7.66L480-553.33l-64.33-64.34q-7.67-7.66-17-7.33-9.34.33-17 8-7.67 7.67-7.67 17t7.67 17l73 73.67V-382h50.66Z"></path></svg></span>Need a hint?</div><div class="hint-content"><p>Use <code>let myBook = Book(title: "The Swift Journey", author: "Alex Developer")</code> to create the instance.</p></div></div></div></article><article class="content-card project-step-container "><div class="code-articles-card-body "><div class="project-step-header d-flex align-items-center"><div class="project-step-badge ">4</div><div class="project-step-title-wrap "><div class="project-step-title">Print the book description</div></div></div><div class="project-instruction">Write a <code>print</code> statement that calls the <code>description()</code> method on <code>myBook</code> and prints the result.</div><div class="project-code-editor"><div class="code-editor-header"><span class="code-editor-label"><svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M16 18l6-6-6-6"></path><path d="M8 6l-6 6 6 6"></path></svg>Swift</span><div class="code-editor-actions"><button class="code-reset-btn">↺ Reset</button><button class="code-solution-btn"><span class="new-material-symbols icon-hw-22 me-1"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 -960 960 960" fill="#d97706"><path d="M602.83-377.25q50.5-50.57 50.5-122.83 0-72.25-50.58-122.75-50.57-50.5-122.83-50.5-72.25 0-122.75 50.58-50.5 50.57-50.5 122.83 0 72.25 50.58 122.75 50.57 50.5 122.83 50.5 72.25 0 122.75-50.58ZM401.5-421.66q-32.17-32.32-32.17-78.5 0-46.17 32.33-78.34 32.32-32.17 78.5-32.17 46.17 0 78.34 32.33 32.17 32.32 32.17 78.5 0 46.17-32.33 78.34-32.32 32.17-78.5 32.17-46.17 0-78.34-32.33ZM234.83-274.67q-110.5-74.66-176.5-192.66-4.33-7.75-6.5-15.93-2.16-8.18-2.16-16.8 0-8.61 2.16-16.75 2.17-8.14 6.5-15.86 66-118 176.5-192.66Q345.33-800 480-800t245.17 74.67q110.5 74.66 176.5 192.66 4.33 7.75 6.5 15.93 2.16 8.18 2.16 16.8 0 8.61-2.16 16.75-2.17 8.14-6.5 15.86-66 118-176.5 192.66Q614.67-200 480-200t-245.17-74.67Z"></path></svg></span>Show Code</button></div></div><textarea class="project-code-textarea" spellCheck="false">struct Book {
var title: String
var author: String
func description() -> String {
return "\(title) by \(author)"
}
}
let myBook = Book(title: "The Swift Journey", author: "Alex Developer")
// Print the description of myBook below
# Your code here</textarea></div><button class="run-code-btn project-run-btn"><svg viewBox="0 0 24 24" fill="currentColor"><polygon points="5 3 19 12 5 21 5 3"></polygon></svg>Run Code</button><div class="project-hint "><div class="hint-toggle-btn"><span class="new-material-symbols icon-hw-24"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 -960 960 960" fill="#d97706"><path d="M480-80q-26.67 0-47.33-12.83Q412-105.67 404-128h-9.33q-27 0-46.84-19.83Q328-167.67 328-194.67v-142.66Q264.33-379 227.17-445 190-511 190-590q0-121 84.5-205.5T480-880q121 0 205.5 84.5T770-590q0 79.67-37.17 145.33Q695.67-379 632-337.33v142.66q0 27-19.83 46.84Q592.33-128 565.33-128H556q-8 22.33-28.67 35.17Q506.67-80 480-80Zm-85.33-114.67h170.66V-236H394.67v41.33Zm0-81.33h170.66v-39.33H394.67V-276Zm110.66-106v-127.33L579-583q7.67-7.67 7.33-17.33-.33-9.67-8-17.34-7.66-7.66-17-7.66-9.33 0-17 7.66L480-553.33l-64.33-64.34q-7.67-7.66-17-7.33-9.34.33-17 8-7.67 7.67-7.67 17t7.67 17l73 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\u003ccode\u003eBook\u003c/code\u003e with two \u003ccode\u003eString\u003c/code\u003e properties named \u003ccode\u003etitle\u003c/code\u003e and \u003ccode\u003eauthor\u003c/code\u003e.\",\"starter_code\":\"\",\"placeholder_code\":\"# Create the Book struct with title and author properties\\n# Your code here\",\"solution_code\":\"struct Book {\\n var title: String\\n var author: String\\n}\",\"validation_type\":\"code_contains\",\"validation_data\":[\"struct Book\",\"var title: String\",\"var author: String\"],\"hint\":\"\u003cp\u003eUse \u003ccode\u003estruct Book { }\u003c/code\u003e and inside it declare \u003ccode\u003evar title: String\u003c/code\u003e and \u003ccode\u003evar author: String\u003c/code\u003e.\u003c/p\u003e\",\"timeout_seconds\":5},{\"step_number\":2,\"title\":\"Add a description() method to the Book struct\",\"instruction\":\"Inside the \u003ccode\u003eBook\u003c/code\u003e struct, add a method called \u003ccode\u003edescription()\u003c/code\u003e that returns a \u003ccode\u003eString\u003c/code\u003e combining the \u003ccode\u003etitle\u003c/code\u003e and \u003ccode\u003eauthor\u003c/code\u003e in the format: \\\"\u003ctitle\u003e by \u003cauthor\u003e\\\".\",\"starter_code\":\"struct Book {\\n var title: String\\n var author: String\\n}\",\"placeholder_code\":\"struct Book {\\n var title: String\\n var author: String\\n\\n // Add the description() method below\\n // Your code here\\n}\",\"solution_code\":\"struct Book {\\n var title: String\\n var author: String\\n\\n func description() -\u003e String {\\n return \\\"\\\\(title) by \\\\(author)\\\"\\n }\\n}\",\"validation_type\":\"code_contains\",\"validation_data\":[\"func description() -\u003e String\",\"return \\\"\\\\(title) by \\\\(author)\\\"\"],\"hint\":\"\u003cp\u003eDefine \u003ccode\u003efunc description() -\u003e String\u003c/code\u003e inside the struct and return the string using \u003ccode\u003e\\\"\\\\(title) by \\\\(author)\\\"\u003c/code\u003e.\u003c/p\u003e\",\"timeout_seconds\":5},{\"step_number\":3,\"title\":\"Create a Book instance\",\"instruction\":\"Create a constant called \u003ccode\u003emyBook\u003c/code\u003e of type \u003ccode\u003eBook\u003c/code\u003e with the title set to \u003ccode\u003e\\\"The Swift Journey\\\"\u003c/code\u003e and the author set to \u003ccode\u003e\\\"Alex Developer\\\"\u003c/code\u003e.\",\"starter_code\":\"struct Book {\\n var title: String\\n var author: String\\n\\n func description() -\u003e String {\\n return \\\"\\\\(title) by \\\\(author)\\\"\\n }\\n}\",\"placeholder_code\":\"struct Book {\\n var title: String\\n var author: String\\n\\n func description() -\u003e String {\\n return \\\"\\\\(title) by \\\\(author)\\\"\\n }\\n}\\n\\n// Create the myBook instance below\\n// Your code here\",\"solution_code\":\"struct Book {\\n var title: String\\n var author: String\\n\\n func description() -\u003e String {\\n return \\\"\\\\(title) by \\\\(author)\\\"\\n }\\n}\\n\\nlet myBook = Book(title: \\\"The Swift Journey\\\", author: \\\"Alex Developer\\\")\",\"validation_type\":\"code_contains\",\"validation_data\":[\"let myBook = Book(title: \\\"The Swift Journey\\\", author: \\\"Alex Developer\\\")\"],\"hint\":\"\u003cp\u003eUse \u003ccode\u003elet myBook = Book(title: \\\"The Swift Journey\\\", author: \\\"Alex Developer\\\")\u003c/code\u003e to create the instance.\u003c/p\u003e\",\"timeout_seconds\":5},{\"step_number\":4,\"title\":\"Print the book description\",\"instruction\":\"Write a \u003ccode\u003eprint\u003c/code\u003e statement that calls the \u003ccode\u003edescription()\u003c/code\u003e method on \u003ccode\u003emyBook\u003c/code\u003e and prints the result.\",\"starter_code\":\"struct Book {\\n var title: String\\n var author: String\\n\\n func description() -\u003e String {\\n return \\\"\\\\(title) by \\\\(author)\\\"\\n }\\n}\\n\\nlet myBook = Book(title: \\\"The Swift Journey\\\", author: \\\"Alex Developer\\\")\",\"placeholder_code\":\"struct Book {\\n var title: String\\n var author: String\\n\\n func description() -\u003e String {\\n return \\\"\\\\(title) by \\\\(author)\\\"\\n }\\n}\\n\\nlet myBook = Book(title: \\\"The Swift Journey\\\", author: \\\"Alex Developer\\\")\\n\\n// Print the description of myBook below\\n# Your code here\",\"solution_code\":\"struct Book {\\n var title: String\\n var author: String\\n\\n func description() -\u003e String {\\n return \\\"\\\\(title) by \\\\(author)\\\"\\n }\\n}\\n\\nlet myBook = Book(title: \\\"The Swift Journey\\\", author: \\\"Alex Developer\\\")\\n\\nprint(myBook.description())\",\"validation_type\":\"output_match\",\"validation_data\":[\"The Swift Journey by Alex Developer\"],\"hint\":\"\u003cp\u003eUse \u003ccode\u003eprint(myBook.description())\u003c/code\u003e to show the description.\u003c/p\u003e\",\"timeout_seconds\":5}],\"final_expected_output\":\"The Swift Journey by Alex Developer\",\"summary\":[\"You learned how to create a struct in Swift with properties.\",\"You added a method inside the struct to return a formatted string.\",\"You created an instance of the struct with specific values.\",\"You called the method on the instance and printed the result.\"],\"extensions\":[\"Add another method to the \u003ccode\u003eBook\u003c/code\u003e struct that returns the title in uppercase.\",\"Create an array of \u003ccode\u003eBook\u003c/code\u003e instances and print descriptions for all books using a loop.\"],\"project_context\":{\"real_world_use\":\"Structs with methods are used to model real-world objects and their behaviors in apps, like books in a library app.\",\"job_relevance\":\"Understanding how to add methods to structs is important for writing clean, organized Swift code in iOS app development.\"},\"metadata\":{\"version\":\"4.2\",\"content_type\":\"programming\",\"total_steps\":4,\"estimated_time_minutes\":15}}},\"subject\":\"swift\",\"title\":\"Methods in structs\"},\"syllabusData\":{\"subject\":\"swift\",\"part\":\"part-2\",\"difficulty\":\"intermediate\",\"metadata\":{\"total_topics\":9,\"total_patterns\":78,\"patterns_with_content\":78,\"created_at\":\"2026-02-28T20:07:09.058261Z\",\"version\":\"4.2\",\"upload_tool\":\"upload_to_mongo.py v2.0\"},\"part_title\":\"OOP and Protocols\",\"subjectTitle\":\"Swift\",\"topics\":[{\"topic_id\":\"swift_p2_t1\",\"title\":\"Closures\",\"order\":1,\"pattern_count\":10,\"patterns\":[{\"pattern_id\":\"swift_why_closures_are_fundamental_in_swift\",\"title\":\"Why closures are fundamental in Swift\",\"order\":1,\"has_content\":true},{\"pattern_id\":\"swift_closure_expression_syntax\",\"title\":\"Closure expression syntax\",\"order\":2,\"has_content\":true},{\"pattern_id\":\"swift_trailing_closure_syntax\",\"title\":\"Trailing closure syntax\",\"order\":3,\"has_content\":true},{\"pattern_id\":\"swift_shorthand_argument_names_0_1\",\"title\":\"Shorthand argument names ($0, 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description() inside the Book struct that returns a String combining the title and author in the format: "