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TypeScript - round with precision down-to n decimal places
0 points
In this article, we would like to show you how to round with precision down-to n decimal places in TypeScript.
In this example, we create a custom function that uses Math.pow() and Math.floor() methods to round with precision down-to n decimal places.
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function floorPrecised(number: number, precision: number): number {2
var power = Math.pow(10, precision);3
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return Math.floor(number * power) / power;5
}6
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// Examples:8
console.log( floorPrecised( 1.1234, 0 ) ); // 19
console.log( floorPrecised( 1.1234, 1 ) ); // 1.110
console.log( floorPrecised( 1.1235, 2 ) ); // 1.1211
console.log( floorPrecised( 1.1235, 3 ) ); // 1.12312
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console.log( floorPrecised( -1.1234, 0 ) ); // -214
console.log( floorPrecised( -1.1234, 1 ) ); // -1.215
console.log( floorPrecised( -1.1234, 2 ) ); // -1.1316
console.log( floorPrecised( -1.1234, 3 ) ); // -1.12417
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console.log( floorPrecised( 1234, -1 ) ); // 123019
console.log( floorPrecised( 1234, -2 ) ); // 120020
console.log( floorPrecised( 1234, -3 ) ); // 100021
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console.log( floorPrecised( 5 , 0 ) ); // 523
console.log( floorPrecised( 5. , 0 ) ); // 524
console.log( floorPrecised( .5, 0 ) ); // 025
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console.log( floorPrecised( 5_000.000_001, 0 ) ); // 500027
console.log( floorPrecised( 5_000.000_001, 6 ) ); // 5000.00000128
console.log( floorPrecised( 5_000.000_001, -3 ) ); // 5000Output:
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12
1.13
1.124
1.1235
6
-27
-1.28
-1.139
-1.12410
11
123012
120013
100014
15
516
517
018
19
500020
5000.00000121
5000