Number

Is Number

This snippet can be used to check whether a provided value is a number.

const isNumber = (n) => !isNaN(Number.parseFloat(n)) && isFinite(n);

Example

isNumber("1"); // false
isNumber(1); // true

Is Square

This snippet can be used to check if a number is a square.

const isSquare = (n) => n >= 0 && Math.sqrt(n) % 1 === 0;

Example

isSquare(36); // true

Round

This snippet can be used to round a number to a specified number of digits.

function round(n, decimals = 0) {
  return Number(`${Math.round(`${n}e${decimals}`)}e-${decimals}`);
}

Example

round(24.99, 1); // 25