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Copy pathIsEven.js
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48 lines (46 loc) · 1.41 KB
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/*
* Even Number: https://simple.wikipedia.org/wiki/Even_number
*
* function to check if number is even
* return true if number is even
* else false
*/
/**
* @function isEven
* @description - Checking if number is even using divisibility by 2
*
* If number is divisible by 2 i.e remainder = 0, then it is even
* therefore, the function will return true
*
* If number is not divisible by 2 i.e remainder != 0, then it is not even i.e odd
* therefore, the function will return false
* @param {number} number
* @return {boolean}
*/
export const isEven = (number) => number % 2 === 0
/**
* @function isEvenBitwise
* @description - Checking if number is even using bitwise operator
* Bitwise AND (&) compares the bits of the 32
* bit binary representations of the number and
* returns a number after comparing each bit:
*
* 0 & 0 -> 0
* 0 & 1 -> 0
* 1 & 0 -> 0
* 1 & 1 -> 1
*
* For odd numbers, the last binary bit will be 1
* and for even numbers, the last binary bit will
* be 0.
*
* As the number is compared with one, all the
* other bits except the last will become 0. The
* last bit will be 0 for even numbers and 1 for
* odd numbers, which is checked with the use
* of the equality operator.
* @param {number} number
* @returns {boolean}
* @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Bitwise_AND
*/
export const isEvenBitwise = (number) => (number & 1) === 0