JavaScript Number isInteger() Method
JavaScript Number.isInteger() method is used to check whether the value passed to it is an integer or not. It returns true if the passed value is an integer, otherwise, it returns false.
Syntax:
Number.isInteger(value);Parameters:
This method accepts a single parameter value that specifies the number that the user wants to check for an integer.
Return Value:
It returns a boolean value,i.e. either true or false. It will return true if the passed value is of the type Number and an integer, it returns false.
Example: This example checks for some values if they are integers or not using the Number.isInteger() method in JavaScript.
Javascript
console.log(Number.isInteger(-2));console.log(Number.isInteger(0));console.log(Number.isInteger(2)); |
Output
true true true
Passing a negative number as an argument:
If a negative integer value is passed to the method as an argument then the method will return true, if the negative value passed to it is not of integer type then the method will return false.
Example: In this example, a negative number is passed as an argument.
Javascript
console.log(Number.isInteger(-2));console.log(Number.isInteger(-2.56)); |
Output
true false
Passing a positive number as an argument:
If a positive integer value is passed to the method as an argument then the method will return true, if the positive value passed to it is not of integer type then the method will return false.
Example: In this example, a positive number is passed as an argument.
Javascript
console.log(Number.isInteger(2)); |
Output
true
Passing zero as an argument:
If zero is passed to the Number.isInteger() method then it will return true as zero is also an integer.
Example: In this example, 0 is passed as an argument.
Javascript
console.log(Number.isInteger(0)); |
Output
true
Passing a number consisting of decimal places as an argument:
If a decimal number is passed as the argument, the method will return false.
Example: In this example, a decimal number is passed as an argument.
Javascript
console.log(Number.isInteger(2.03)); |
Output
false
Passing a string as an argument:
If the argument is passed to the Number. integer () method is of type string then it will return false.
Example: In this example, a string is passed as an argument.
Javascript
console.log("Output : " + Number.isInteger("hi")); |
Output
Output : false
We have a complete list of Javascript Number Methods, to check those please go through the Javascript Number Complete Reference article.
Supported Browsers:
- Google Chrome 34 and above
- Edge 12 and above
- Firefox 16 and above
- Apple Safari 9 and above
- Opera 21 and above
JavaScript is best known for web page development but it is also used in a variety of non-browser environments. You can learn JavaScript from the ground up by following this JavaScript Tutorial and JavaScript Examples.
