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JavaScript - Math.floor() method example
14
points
The Math.floor() function returns an integer value that is smaller than or equal to the argument - the result of round down operation.
// ONLINE-RUNNER:browser;
console.log( Math.floor( 5 ) ); // 5
console.log( Math.floor( 2.49 ) ); // 2
console.log( Math.floor( 2.50 ) ); // 2
console.log( Math.floor( 2.51 ) ); // 2
console.log( Math.floor( -2.49 ) ); // -3
console.log( Math.floor( -2.50 ) ); // -3
console.log( Math.floor( -2.51 ) ); // -3
console.log( Math.floor( 0.999 ) ); // 0
console.log( Math.floor( 1.001 ) ); // 1
console.log( Math.floor( -1.001 ) ); // -2
1. Documentation
| Syntax | Math.floor(number) |
| Parameters | number - integer or float number value (primitive value). |
| Result |
Rounded down If If If |
| Description | floor is a static method that takes only one parameter and returns a rounded-down value. |
2. Rounding with precision down-to n places example
// ONLINE-RUNNER:browser;
function floorPrecised(number, precision) {
var power = Math.pow(10, precision);
return Math.floor(number * power) / power;
}
// Example:
console.log( floorPrecised( 5 , 0 ) ); // 5
console.log( floorPrecised( 5. , 0 ) ); // 5
console.log( floorPrecised( .5, 0 ) ); // 0
console.log( floorPrecised( 1.1234, 0 ) ); // 1
console.log( floorPrecised( 1.1234, 1 ) ); // 1.1
console.log( floorPrecised( 1.1235, 2 ) ); // 1.12
console.log( floorPrecised( 1.1235, 3 ) ); // 1.123
console.log( floorPrecised( -1.1234, 0 ) ); // -2
console.log( floorPrecised( -1.1234, 1 ) ); // -1.2
console.log( floorPrecised( -1.1234, 2 ) ); // -1.13
console.log( floorPrecised( -1.1234, 3 ) ); // -1.124
console.log( floorPrecised( 1234, -1 ) ); // 1230
console.log( floorPrecised( 1234, -2 ) ); // 1200
console.log( floorPrecised( 1234, -3 ) ); // 1000
console.log( floorPrecised( 5_000.000_001, 0 ) ); // 5000
console.log( floorPrecised( 5_000.000_001, 6 ) ); // 5000.000001
console.log( floorPrecised( 5_000.000_001, -3 ) ); // 5000