declare constant javascript code example

Example 1: const in javascript

const value = 10;
const constant = value;

Example 2: js define constant by element id

const elem = document.getElementById('elementID');

Example 3: const js +=

const foo; // Errror as const cannot be kept un-initialized;
const foo = "foo";
console.log(foo); //Output: foo
foo += " bar"; //Error