JAVASCRIPT

js math round up

console.log(Math.ceil(0.2));
// expected output: 1

console.log(Math.ceil(4));
// expected output: 4

console.log(Math.ceil(7.004));
// expected output: 8

console.log(Math.ceil(-7.004));
// expected output: -7

round down the number javascript

+3.5 => +3.0
-3.5 => -4.0

+3.5 => +3.0 using Math.floor()
-3.5 => -3.0 using Math.ceil()

round value up javascript

// Will round innerHTML value to 2

document.getElementById("myId").innerHTML = Math.ceil(1.1);

round up or round down number automatically javascript

Math.round(3.14159)  // 3
Math.round(3.5)      // 4
Math.floor(3.8)      // 3
Math.ceil(3.2)       // 4

round up to nearest 0.5 javascript

// Simplest way
function roundHalf(num) {
    return Math.round(num*2)/2;
}

round down javascript

// Will round innerHTML value to 2

document.getElementById("myId").innerHTML = Math.floor(2.9);

round up or round down number automatically javascript

Math.round(3.14159 * 100) / 100  // 3.14

3.14159.toFixed(2);              // 3.14 returns a string
parseFloat(3.14159.toFixed(2));  // 3.14 returns a number