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JavaScript: Iterate over a callback n times

JavaScript fundamental (ES6 Syntax): Exercise-127 with Solution

Write a JavaScript program to iterate over a callback n times.

  • Use Function.prototype.call() to call fn n times or until it returns false.
  • Omit the last argument, context, to use an undefined object (or the global object in non-strict mode).

Sample Solution:

JavaScript Code:

//#Source https://bit.ly/2neWfJ2 
const times = (n, fn, context = undefined) => {
  let i = 0;
  while (fn.call(context, i) !== false && ++i < n) {}
};
var output = '';
times(5, i => (output += i));
console.log(output); // 01234

Sample Output:

01234

Flowchart:

flowchart: Iterate over a callback n times

Live Demo:

See the Pen javascript-basic-exercise-127-1 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]]