JavaScript - Swap two variables using bit manipulation
JavaScript Bit Manipulation: Exercise-2 with Solution
Write a JavaScript program to swap two variables using bit manipulation.
Test Data:
(12, 15) -> (15,12)
Sample Solution:
JavaScript Code:
const swap = (x, y) => {
x = x ^ y
y = x ^ y
x = x ^ y
return {a:x, b:y}
}
x = 12
y = 15
console.log("Before swap: x = " + x + " and y = " + y)
const {a,b} = swap(x, y)
console.log("After swap: x = " + a + " and y = " + b)
Sample Output:
Before swap: x = 12 and y = 15 After swap: x = 15 and y = 12
Flowchart:

Live Demo:
See the Pen javascript-bit-manipulation-exercise-1 by w3resource (@w3resource) on CodePen.
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JavaScript: Tips of the Day
Returns the sum of an array, after mapping each element to a value using the provided function
Example:
const tips_sumBy = (arr, fn) => arr.map(typeof fn === 'function' ? fn : val => val[fn]).reduce((acc, val) => acc + val, 0); console.log(tips_sumBy([{ n: 2 }, { n: 4 }, { n: 6 }, { n: 8 }], o => o.n)); console.log(tips_sumBy([{ n: 1 }, { n: 3 }, { n: 5 }, { n: 7 }], 'n'));
Output:
20 16
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