# How do I check if a number is an integer in JavaScript?Gable E

To check if a number is an integer in JavaScript, you can use various methods and techniques. Here's a step-by-step guide on how to achieve this:
**1. Get the number you want to check:**

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`const number = 42;`

**2. Use the Number.isInteger() method:**
The

`Number.isInteger()`

method is a built-in JavaScript method that determines whether a value is an integer. It returns`true`

if the value is an integer and`false`

otherwise.
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`const isInteger = Number.isInteger(number); console.log(isInteger); // Output: true`

**3. Use the Math.floor() and strict equality (===) check:**
You can compare the number to its floor value using the

`Math.floor()`

method and strict equality (===) to check if they are the same. If they are equal, the number is an integer.
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`const isInteger = number === Math.floor(number); console.log(isInteger); // Output: true`

**4. Use the Math.trunc() and strict equality (===) check:**
Similar to the previous approach, you can compare the number to its truncated value using the

`Math.trunc()`

method and strict equality (===) to check if they are the same. If they are equal, the number is an integer.
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`const isInteger = number === Math.trunc(number); console.log(isInteger); // Output: true`

**5. Use the modulo operator (%) and strict equality (===) check:**
Another approach is to use the modulo operator (%) to check if the number divided by 1 leaves no remainder. If the remainder is 0, the number is an integer.

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`const isInteger = number % 1 === 0; console.log(isInteger); // Output: true`

Choose the method that best fits your requirements and the specific context in which you need to check if a number is an integer. The`Number.isInteger()`

method is recommended for its simplicity and accuracy, but the other methods provide alternative approaches if needed.

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