How do I display a leading zero for all numbers with less than two digits? 1 → 01 10 → 10 100 → 100

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To display a leading zero for numbers with less than two digits in JavaScript, you can use the String.prototype.padStart() method. This method pads the string with a specified character (in this case, "0") to a specified length (in this case, 2).

Here's an example:

javascript
function addLeadingZero(number) {
    return String(number).padStart(2, '0');
}

console.log(addLeadingZero(1));   // Output: "01"
console.log(addLeadingZero(10));  // Output: "10"
console.log(addLeadingZero(100)); // Output: "100"

In the addLeadingZero() function, the String() constructor is used to convert the number to a string, and then padStart() is used to ensure the resulting string is at least 2 characters long, with leading zeros added as needed.

This method ensures consistent formatting of numbers with leading zeros for numbers with less than two digits.

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