Round a Number Up to the Next Multiple of 5 in JavaScript

Given a positive integer n and the task is to round the number to the next whole number divisible by 5.  There are various methods to Round off a number to the next multiple of 5 using JavaScript.

• Using Math.ceil() method
• Using Math.floor() method

[Approach 1]: The approach involves scaling the number down, rounding it up, and then scaling it back to the nearest multiple of 5.

• Take the number in a variable.
• Divide it by 5 and get the decimal value.
• Take the ceil value of the decimal value by using math.ceil().
• Multiply it by 5 to get the result.

function r1(x) {     
    return Math.ceil(x / 5) * 5;
}
var n = 34;
console.log(r1(n));

35

[Approach 2]: This approach checks divisibility by 5 and adjusts the number only when needed to reach the next multiple.

• Take the number in a variable.
• If it is divisible by 5, return the same number.
• Else divide it by 5, take the floor value and again multiply it by 5 and add 5 as well.

function r2(x) {
    if (x % 5 === 0) {
        return Math.floor(x / 5) * 5;
    } else {
        return (Math.floor(x / 5) * 5) + 5;
    }
}

var n = 34;
console.log(r2(n));