JavaScript Strings

Question 1

What do template literals (template strings) allow in JavaScript?

Accepted Answer

String interpolation with `${}` and multi-line strings using backticks

Answer

Template literals, enclosed in backticks (`), allow embedded expressions using `${expression}`, and support multi-line strings directly without escape sequences.

Question 2

What does `String.prototype.trim()` do?

Accepted Answer

Removes whitespace from the beginning and end of a string

Answer

`trim()` removes leading and trailing whitespace (spaces, tabs, newlines) from a string. It does not modify whitespace in the middle of the string. `trimStart()` and `trimEnd()` target only one side.

Question 3

What does `String.prototype.split()` return?

Accepted Answer

An array of substrings divided by the separator

Answer

`split(separator)` divides a string into an ordered array of substrings by searching for the separator, then returns the array.

Question 4

What does `String.prototype.includes()` do?

Accepted Answer

Returns true if the string contains the given substring, otherwise false

Answer

`includes(searchString, position)` determines whether one string can be found within another, returning `true` or `false`. It performs a case-sensitive search.

Question 5

What does `String.prototype.replace()` do?

Accepted Answer

Replaces the first occurrence of a pattern (string or regex without `g` flag) with a replacement

Answer

`replace(pattern, replacement)` returns a new string with the first match replaced. To replace all occurrences with a string pattern, use `replaceAll()` or a regex with the `g` flag.

JavaScript Practice Test

JavaScript Practice Test

JavaScript Strings