startsWith method
The startsWith method checks
if a string starts with the substring
specified in the first parameter. If
it starts, then it returns true,
and if it doesn't, then
false. The second optional
parameter of the method is the
position from which to start checking
(by default, from the start of the
string).
Syntax
javascriptstring.startsWith(what to search, [where to start checking]);
Example
Let's check if a string starts with a given substring:
javascriptlet str = 'abcde';
let res = str.startsWith('abc');
console.log(res);
The code execution result:
javascripttrue
Example
Let's check if a string starts with a given substring:
javascriptlet str = 'abcde';
let res = str.startsWith('xxx');
console.log(res);
The code execution result:
javascriptfalse
Example
Let's start checking from a given position:
javascriptlet str = 'abcde';
let res = str.startsWith('bc', 1);
console.log(res);
The code execution result:
javascripttrue