`String.prototype.startsWith()`

Determines whether a string begins with the given substring.

Since ES2015 Spec ↗

Syntax

str.startsWith(searchString, position)

Name	Type	Required	Description
`searchString`	`string`	Yes	The substring to test for at the start.
`position`	`number`	No	Position in the string at which to begin the check. Defaults to 0.

boolean — true if the string starts with the substring; otherwise false.

console.log('hello world'.startsWith('hello'));

Output

true

console.log('hello world'.startsWith('world', 6));

Output

true

Case-sensitive. Throws TypeError if given a regular expression. The optional position lets you test starting from an offset.