JavaScript: Execute a provided function once for each array element, starting from the array's last element
JavaScript fundamental (ES6 Syntax): Exercise-76 with Solution
Write a JavaScript program to execute a provided function once for each array element, starting with the array's last element.
- Use Array.prototype.slice() to clone the given array and Array.prototype.reverse() to reverse it.
- Use Array.prototype.forEach() to iterate over the reversed array.
Sample Solution:
JavaScript Code:
//#Source https://bit.ly/2neWfJ2
const forEachRight = (arr, callback) =>
arr
.slice(0)
.reverse()
.forEach(callback);
forEachRight([1, 2, 3, 4], val => console.log(val));
Sample Output:
4 3 2 1
Flowchart:

Live Demo:
See the Pen javascript-basic-exercise-76-1 by w3resource (@w3resource) on CodePen.
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JavaScript: Tips of the Day
Parse an HTTP Cookie header string and return an object of all cookie name-value pairs
Example:
const parseCookie = str => str .split(';') .map(v => v.split('=')) .reduce((acc, v) => { acc[decodeURIComponent(v[0].trim())] = decodeURIComponent(v[1].trim()); return acc; }, {}); console.log(parseCookie('foo=bar; equation=E%3Dmc%5E2')); // { foo: 'bar', equation: 'E=mc^2' }
Output:
[object Object] { equation: "E=mc^2", foo: "bar" }
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