Number.isInteger() – How to Check If a Number Is an Integer
Number.isInteger() checks if its argument is an integer. If so, it returns true
. Otherwise, the method returns false
.
Syntax of the Number.isInteger()
Method
Section titled “Syntax of the Number.isInteger() Method”Number.isInteger()
accepts only one required argument. Here is the syntax:
Number.isInteger(value);
The value
argument represents the item you wish to test if it is an integer.
Examples of the Number.isInteger()
Method
Section titled “Examples of the Number.isInteger() Method”Below are examples of the Number.isInteger()
method.
Is 578
an integer?
Section titled “Is 578 an integer?”Number.isInteger(578);
// The invocation above will return: true
Is 0.99
an integer?
Section titled “Is 0.99 an integer?”Number.isInteger(0.99);
// The invocation above will return: false
Is "test"
an integer?
Section titled “Is "test" an integer?”Number.isInteger("test");
// The invocation above will return: false
Is negative 300
an integer?
Section titled “Is negative 300 an integer?”Number.isInteger(-300);
// The invocation above will return: true
Is zero an integer?
Section titled “Is zero an integer?”Number.isInteger(0);
// The invocation above will return: true
Is Math.PI
an integer?
Section titled “Is Math.PI an integer?”Number.isInteger(Math.PI);
// The invocation above will return: false