how to get the value startswith in javascript code example

Example 1: javascript string starts with

//checks if a string starts with a word
function startsWith(str, word) {
    return str.lastIndexOf(word, 0) === 0;
}
startsWith("Welcome to earth.","Welcome"); //true

Example 2: javascript string starts with

const s = 'I am going to become a FULL STACK JS Dev with Coderslang';

console.log(s.startsWith('I am'));             // true
console.log(s.startsWith('You are'));          // false

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