EN
JavaScript - round with precision to n decimal places
11 points
In this article, we would like to show you how to round numbers with precision to n decimal places in JavaScript.
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function roundPrecised(number, precision) {2
var power = Math.pow(10, precision);3
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return Math.round(number * power) / power;5
}6
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// Usage example:9
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console.log( roundPrecised( 5 , 0 ) ); // 511
console.log( roundPrecised( 5. , 0 ) ); // 512
console.log( roundPrecised( .5, 0 ) ); // 113
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console.log( roundPrecised( 1.2345, 0 ) ); // 115
console.log( roundPrecised( 1.2345, 1 ) ); // 1.216
console.log( roundPrecised( 1.2345, 2 ) ); // 1.2317
console.log( roundPrecised( 1.2345, 3 ) ); // 1.23518
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console.log( roundPrecised( -1.2345, 0 ) ); // -120
console.log( roundPrecised( -1.2345, 1 ) ); // -1.221
console.log( roundPrecised( -1.2345, 2 ) ); // -1.2322
console.log( roundPrecised( -1.2345, 3 ) ); // -1.23423
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console.log( roundPrecised( 12345, -1 ) ); // 1235025
console.log( roundPrecised( 12345, -2 ) ); // 1230026
console.log( roundPrecised( 12345, -3 ) ); // 12000