JavaScript: Create a new array out of the two supplied by creating each possible pair from the arrays
JavaScript fundamental (ES6 Syntax): Exercise-25 with Solution
Write a JavaScript program to create a new array out of the two supplied by creating each possible pair from the arrays.
- Use Array.prototype.reduce(), Array.prototype.map() and Array.prototype.concat() to produce every possible pair from the elements of the two arrays.
Sample Solution:
JavaScript Code:
//#Source https://bit.ly/2neWfJ2
const xProd = (a, b) => a.reduce((acc, x) => acc.concat(b.map(y => [x, y])), []);
console.log(xProd([1, 2], ['a', 'b']));
console.log(xProd([1, 2], [1, 2]));
console.log(xProd(['a', 'b'], ['a', 'b']));
Sample Output:
[[1,"a"],[1,"b"],[2,"a"],[2,"b"]] [[1,1],[1,2],[2,1],[2,2]] [["a","a"],["a","b"],["b","a"],["b","b"]]
Pictorial Presentation:
Flowchart:

Live Demo:
See the Pen javascript-basic-exercise-1-25 by w3resource (@w3resource) on CodePen.
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JavaScript: Tips of the Day
Chunks an array into n smaller arrays
Example:
const tips_chunkIntoN = (arr, n) => { const size = Math.ceil(arr.length / n); return Array.from({ length: n }, (v, i) => arr.slice(i * size, i * size + size) ); } console.log(tips_chunkIntoN([1, 2, 3, 4, 5, 6, 7,8], 4));
Output:
[[1,2],[3,4],[5,6],[7,8]]
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