js number add zero before
('0' + 11).slice(-2) // '11'
('0' + 4).slice(-2) // '04'
js number add zero before
('0' + 11).slice(-2) // '11'
('0' + 4).slice(-2) // '04'
add leading zeros javascript
const str1 = '5';
console.log(str1.padStart(2, '0')); // expected output: "05"
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