The Math.floor() function rounds down a number to the next smallest integer.
Example
let number = 38.8;
// round number to nearest smallest number
let roundedNumber = Math.floor(number);
console.log(roundedNumber);
// Output: 38
Math.floor() Syntax
The syntax of the Math.floor() function is:
Math.floor(x)
floor(), being a static method, is called using the Math class name.
Math.floor() Parameters
The Math.floor() function takes in:
- x - A number
Math.floor() Return Value
- Returns the largest integer less than or equal to a given number.
- Returns 0 for
null.
Example: Using Math.floor()
// using Math.floor()
var num = Math.floor(1.8645);
console.log(num); // 1
var num = Math.floor(-0.456);
console.log(num); // -1
var num = Math.floor("4");
console.log(num); // 4
// Returns 0 for null
var num = Math.floor(null);
console.log(num); // 0
// Returns NaN for non-numeric types
var num = Math.floor("JavaScript");
console.log(num); // NaN
var num = Math.floor(NaN);
console.log(num); // NaN
Output
1 -1 4 0 NaN NaN
Note: Math.floor() returns 0 for null rather than NaN.
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