Math.round

Category:Math

Math.round(x)

Category: Math

Returns the number rounded to the nearest integer.

Some apps need to know how to round a number to the nearest integer. The tie-breaking rule for half-way numbers (ending in ".5") is to round them up to the next largest integer.

Examples

var x = Math.round(15.2);
console.log(x);
var y = Math.round(23.5);
console.log(y);
var z = Math.round(-7.8);
console.log(z);

Floor Uses arithmetic and round() to round a number down to the next smallest integer.

// Uses arithmetic and round() to round a number down to the next smallest integer.
function floor(n) {
  return Math.round(n-0.5);
}
console.log(floor(24.8));
console.log(floor(-23.5));

Syntax

Math.round(x);

Parameters

Name	Type	Required?	Description
x	number	Yes	An arbitrary number or variable.

Returns

A number representing the integer nearest to x, or NaN if x is not a number or no parameter is provided.

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