endsWith

The endsWith() method checks whether a string ends with a specific substring, taking an optional position into account.

Interactive example

Syntax

Classic signature

function endsWith<
	GenericInput extends string, 
	GenericSearchString extends string
>(
	input: GenericInput, 
	searchString: GenericSearchString
): input is Extract<GenericInput, `${string}${GenericSearchString}`>;

Curried signature

function endsWith<
	GenericSearchString extends string, 
	GenericInput extends string
>(
	searchString: GenericSearchString
): (
	input: GenericInput
) => input is Extract<GenericInput, `${string}${GenericSearchString}`>;

Parameters

• input: The string to check.
• searchString: The substring to look for at the end of input.

Return value

A boolean indicating whether input ends with searchString. The return type uses a conditional type assertion to narrow the type of input when the condition is true.

See also

• matchAll: Retrieves all matches of a regular expression with their groups.
• match: Retrieves matches of a regular expression.
• search: Searches for a match with a regular expression.
• lastIndexOf: Returns the index of the last occurrence of a substring.

Sources

• MDN Web Docs - String.prototype.endsWith()