how to check whether a string contains a word at beginning in js code example

Example 1: js string contais

const string = "foo";
const substring = "oo";

console.log(string.includes(substring));

Example 2: check if js string begin with word

const str1 = 'Saturday night plans';

console.log(str1.startsWith('Sat'));
// expected output: true

console.log(str1.startsWith('Sat', 3));
// expected output: false