JavaScript floor Method is used to Round a number down to its nearest integer. It required a single parameter value which is the number you want to be rounded to its nearest integer.
The Math.floor() function returns the largest integer less than or equal to a given number.
Note: If the passed argument is an integer, the value will not be rounded.
Syntax
Math.floor(value)Math floor JavaScript Example
<!DOCTYPE html>
<html>
<body>
<p id="demo"></p>
<script>
var a = Math.floor(7.902334454);
document.getElementById("demo").innerHTML = a;
</script>
</body>
</html>Output: 7
Q: What if we passed a non-numeric string as a parameter in the JS floor method?
Answer: If the non-numeric string passed as a parameter then it will return NaN.
var a = Math.floor("abc");
document.getElementById("demo").innerHTML = a;
Q: Will JS throw an error if the passing value in the JS floor method non-numeric?
Answer: No it will not throw an error if the passing value is non-numeric only. It will return NaN on the following conditions:-
- A non-numeric string
- Array with more than 1 integer
- Empty variable
- Empty string
- Empty array
Do comment if you have any doubts and questions on this tutorial.
Note: The All JS Examples codes are tested on the Safari browser (Version 12.0.2) and Chrome.
OS: macOS 10.14 Mojave
Code: HTML 5 Version