What is the Purpose of the % Operator in JavaScript, and How is it Used?

The % Operator in JavaScript

JavaScript's % operator performs the modulus operation. It calculates the remainder when one number is divided by another and returns the result. This operator is used to check if a number is divisible by another without having to use floating-point division.

Operation:

The modulus operator is used as follows:

<code class="javascript">var1 % var2</code>

Where:

• var1 is the dividend
• var2 is the divisor

Example:

<code class="javascript">console.log(12 % 5); // 2
console.log(-1 % 2); // -1</code>

Usage Cases:

The % operator has various applications, including:

• Checking if a number is even or odd (the remainder of a number by 2 indicates if it's even or odd)
• Finding the last digit of a number (the remainder of a number by 10 gives the last digit)
• Calculating the position of an element within an array (the remainder of the index by the array length gives the position)

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