JavaScript: Initialize a two dimension array of given width and height and value
JavaScript fundamental (ES6 Syntax): Exercise-53 with Solution
Write a JavaScript program to Initialize a two dimension array of given width and height and value.
- Use Array.from() and Array.prototype.map() to generate h rows where each is a new array of size w.
- Use Array.prototype.fill() to initialize all items with value val.
- Omit the last argument, val, to use a default value of null.
Sample Solution:
JavaScript Code:
//#Source https://bit.ly/2neWfJ2
const initialize_2D_Array = (w, h, val = null) =>
Array.from({ length: h }).map(() => Array.from({ length: w }).fill(val));
console.log(initialize_2D_Array(2, 2, 0));
console.log(initialize_2D_Array(3, 3, 3));
Sample Output:
[[0,0],[0,0]] [[3,3,3],[3,3,3],[3,3,3]]
Pictorial Presentation:
Flowchart:

Live Demo:
See the Pen javascript-basic-exercise-1-53 by w3resource (@w3resource) on CodePen.
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Previous: Write a JavaScript program to group the elements of an given array based on the given function.
Next: Write a JavaScript program to initialize an array containing the numbers in the specified range where start and end are inclusive with their common difference step.
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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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