JavaScript 中「%」運算子的作用是什麼？

Unraveling the Essence of the % Operator in JavaScript

The mysterious % symbol in JavaScript is known as the modulo operator. It plays a pivotal role in mathematical operations by returning the remainder after dividing one operand by another.

The modulo operator is typically denoted as follows:

var1 % var2

Where var1 and var2 represent the operands.

For instance, if we have the expression 12 % 5, the result would be 2. This is because 12 divided by 5 leaves a remainder of 2.

The modulo operator proves invaluable in various scenarios:

• Finding remainders: Determining the number left over after dividing one number by another.
• Checking for even or odd numbers: By checking if the remainder of a number divided by 2 is 0 or 1, respectively.
• Cyclic loops: Iterating through a set of numbers with a specific interval by using the modulo operator to reset the counter at certain intervals.

Remember, the sign of the result will match that of the first operand. Therefore, -1 % 2 would return -1. For comprehensive documentation and additional insights into the modulo operator, refer to the official JavaScript documentation or consult the language specification for further clarification.

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