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JavaScript - how to round with precision up-to n decimal places example

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2 points

In JavaScript it is possible to round up numbers with precision in following way.

1. Custom method example

// ONLINE-RUNNER:browser;

function ceilPrecised(number, precision) {
	var power = Math.pow(10, precision);

  	return Math.ceil(number * power) / power;
}

// Examples:

console.log( ceilPrecised(     5  ,  0 ) ); // 5
console.log( ceilPrecised(     5. ,  0 ) ); // 5
console.log( ceilPrecised(      .5,  0 ) ); // 1

console.log( ceilPrecised(  1.1234,  0 ) ); // 2
console.log( ceilPrecised(  1.1234,  1 ) ); // 1.2
console.log( ceilPrecised(  1.1235,  2 ) ); // 1.13
console.log( ceilPrecised(  1.1235,  3 ) ); // 1.124

console.log( ceilPrecised( -1.1234,  0 ) ); // -1
console.log( ceilPrecised( -1.1234,  1 ) ); // -1.1
console.log( ceilPrecised( -1.1234,  2 ) ); // -1.12
console.log( ceilPrecised( -1.1234,  3 ) ); // -1.123
 
console.log( ceilPrecised(    1234, -1 ) ); // 1240
console.log( ceilPrecised(    1234, -2 ) ); // 1300
console.log( ceilPrecised(    1234, -3 ) ); // 2000

console.log( ceilPrecised(  5_000.000_001,  0 ) ); // 5001
console.log( ceilPrecised(  5_000.000_001,  6 ) ); // 5000.000001
console.log( ceilPrecised(  5_000.000_001, -3 ) ); // 6000

See also

  1. JavaScript - Math.ceil() method example
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