String methods (substring, split, trim) in Kotlin - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the substring method do in Kotlin?

It extracts a part of a string from a start index up to, but not including, an end index, returning a new string.

beginner

How does the split method work on a string?

It divides the string into parts based on a delimiter and returns a list of substrings.

beginner

What is the purpose of the trim method in Kotlin strings?

It removes any whitespace characters from the start and end of the string.

beginner

Given val text = " Hello Kotlin ", what does text.trim() return?

It returns the string "Hello Kotlin" without the spaces at the start and end.

beginner

How would you get the substring "Kotlin" from val text = "Hello Kotlin"?

Use text.substring(6) to get "Kotlin" starting from index 6 to the end.

What does "apple,banana,orange".split(",") return?

A "applebananaorange"

B [",", ",", ","]

C ["apple,banana,orange"]

D ["apple", "banana", "orange"]

The split method divides the string at each comma, returning a list of the parts.

What is the result of " Kotlin ".trim()?

A " Kotlin "

B " Kotlin "

C "Kotlin"

D ""

Trim removes spaces from the start and end, leaving just "Kotlin".

Which substring call extracts "cat" from "concatenate"?

A substring(3, 6)

B substring(0, 3)

C substring(4, 7)

D substring(5, 8)

Characters at indexes 3 to 5 are 'c', 'a', 't' which form "cat".

What does "one two three".split(" ") produce?

A ["one two three"]

B ["one", "two", "three"]

C "onetwothree"

D [" ", " "]

Splitting by space divides the string into words.

If val s = " abc ", what does s.substring(2, 5) return?

A "abc"

B " a"

C "bc "

D " "

Indexes 2 to 4 are 'a', 'b', 'c', so substring returns "abc".

Explain how to use substring, split, and trim methods on strings in Kotlin with simple examples.

Think about cutting, breaking, and cleaning a string.

Describe a real-life situation where you might use split and trim methods together on a string.

Imagine cleaning and breaking a sentence typed by a user.