make every first letter capitalize javascript array code example

Example 1: javascript capitalize first letter

const lower = 'this is an entirely lowercase string';
const upper = lower.charAt(0).toUpperCase() + lower.substring(1);

Example 2: capitalize first letter in array of strings javascript

for(var i = 1 ; i < newArr.length ; i++){
            newArr[i].charAt(0).toUpperCase();