how does .endswith javascript code example

Example 1: javascript endswith

"Hello world".endsWith("world");//true
"Hello world".endsWith("Hello");//false

Example 2: javascript string ends with

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

console.log(s.endsWith('lang'));             // true
console.log(s.endsWith('LANG'));             // false