Why Continue statement in Go? - Purpose & Use Cases

The Big Idea

What if you could skip unwanted steps in a loop with just one simple command?

The Scenario

Imagine you are sorting through a list of numbers to find only the even ones. You write code that checks each number, but you have to write extra steps to skip the odd numbers manually every time.

The Problem

This manual way means you write more code, making it longer and harder to read. You might forget to skip some numbers, causing bugs. It also slows down your work because you handle each case fully instead of quickly moving on.

The Solution

The continue statement lets you skip the rest of the current loop cycle instantly and jump to the next item. This keeps your code clean, short, and easy to understand while avoiding unnecessary checks.

Before vs After

✗ Before

for i := 0; i < len(numbers); i++ {
    if numbers[i] % 2 == 0 {
        // process even number
    } else {
        // skip odd number manually
    }
}

✓ After

for i := 0; i < len(numbers); i++ {
    if numbers[i] % 2 != 0 {
        continue
    }
    // process even number
}

What It Enables

It enables you to write loops that quickly skip unwanted cases, making your programs faster and easier to maintain.

Real Life Example

When processing user inputs, you can skip invalid entries immediately with continue, so your program only handles valid data without extra checks.

Key Takeaways

Manual skipping in loops is slow and error-prone.

Continue lets you jump to the next loop cycle instantly.

This makes your code cleaner, faster, and easier to read.

Practice

1. What does the continue statement do inside a loop in Go?

easy

A. Skips the rest of the current loop iteration and moves to the next iteration

B. Stops the entire loop immediately

C. Exits the current function

D. Repeats the current iteration without moving forward

Solution

1. Step 1: Understand the role of continue in loops

   The continue statement tells the loop to skip the remaining code in the current iteration.

2. Step 2: Identify what happens after continue

   After skipping, the loop moves on to the next iteration without stopping the whole loop.

3. Final Answer:

   Skips the rest of the current loop iteration and moves to the next iteration -> Option A

4. Quick Check:

   continue skips current step [OK]

Hint: Remember: continue skips current step, not whole loop [OK]

Common Mistakes:

• Confusing continue with break
• Thinking continue exits the function
• Assuming continue repeats the iteration

2. Which of the following is the correct syntax to use continue inside a for loop in Go?

easy

A. continue

B. continue {}

C. continue()

D. continue;

Solution

1. Step 1: Recall Go syntax for statements

   In Go, continue is a keyword used alone without parentheses or semicolons.

2. Step 2: Identify the correct form

   The correct usage is simply continue by itself inside the loop.

3. Final Answer:

   continue -> Option A

4. Quick Check:

   Go statements like continue have no parentheses or semicolons [OK]

Hint: Use continue alone, no parentheses or semicolon needed [OK]

Common Mistakes:

• Adding semicolon after continue
• Using continue as a function with parentheses
• Using braces {} after continue

3. What will be the output of the following Go code?

for i := 1; i <= 5; i++ {
    if i == 3 {
        continue
    }
    fmt.Print(i, " ")
}

medium

A. 1 2 3 4 5

B. 1 2

C. 3 4 5

D. 1 2 4 5

Solution

1. Step 1: Analyze the loop and condition

   The loop runs from 1 to 5. When i equals 3, continue skips printing 3.

2. Step 2: Determine printed values

   Values 1, 2, 4, and 5 are printed with spaces. Number 3 is skipped.

3. Final Answer:

   1 2 4 5 -> Option D

4. Quick Check:

   continue skips printing 3 [OK]

Hint: Skip printing when continue hits condition [OK]

Common Mistakes:

• Including 3 in output
• Stopping loop instead of skipping
• Printing nothing due to misunderstanding continue

4. Identify the error in this Go code snippet using continue:

for i := 0; i < 5; i++ {
    if i == 2 {
        continue()
    }
    fmt.Println(i)
}

medium

A. The loop condition is incorrect

B. fmt.Println is used incorrectly

C. Using parentheses with continue causes a syntax error

D. continue should be replaced with break

Solution

1. Step 1: Check the usage of continue

   In Go, continue is a statement without parentheses. Using continue() causes a syntax error.

2. Step 2: Verify other parts

   The loop condition and fmt.Println usage are correct. The error is only in the continue syntax.

3. Final Answer:

   Using parentheses with continue causes a syntax error -> Option C

4. Quick Check:

   continue has no parentheses in Go [OK]

Hint: Don't add parentheses after continue [OK]

Common Mistakes:

• Writing continue() instead of continue
• Confusing continue with break
• Misreading loop condition as error

5. You want to print all numbers from 1 to 10 except multiples of 3 using a for loop and continue. Which code snippet correctly achieves this?

hard

A. for i := 1; i <= 10; i++ {
if i % 3 != 0 {
continue
}
fmt.Println(i)
}

B. for i := 1; i <= 10; i++ {
if i % 3 == 0 {
continue
}
fmt.Println(i)
}

C. for i := 1; i <= 10; i++ {
if i % 3 == 0 {
break
}
fmt.Println(i)
}

D. for i := 1; i <= 10; i++ {
if i % 3 == 0 {
fmt.Println(i)
continue
}
}

Solution

1. Step 1: Understand the goal

   We want to skip printing numbers divisible by 3 and print all others from 1 to 10.

2. Step 2: Analyze each option

   for i := 1; i <= 10; i++ { if i % 3 == 0 { continue } fmt.Println(i) } skips printing multiples of 3 using continue correctly. for i := 1; i <= 10; i++ { if i % 3 != 0 { continue } fmt.Println(i) } skips non-multiples, printing only multiples. for i := 1; i <= 10; i++ { if i % 3 == 0 { break } fmt.Println(i) } breaks the loop early. for i := 1; i <= 10; i++ { if i % 3 == 0 { fmt.Println(i) continue } } prints multiples and skips others incorrectly.

3. Final Answer:

   for i := 1; i <= 10; i++ { if i % 3 == 0 { continue } fmt.Println(i) } -> Option B

4. Quick Check:

   continue skips multiples of 3, print others [OK]

Hint: Use if condition with continue to skip unwanted values [OK]

Common Mistakes:

• Using break instead of continue
• Reversing the condition logic
• Printing inside the continue block