JavaScript: Iterate over a callback n times

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

Iterate Callback n Times

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 

// Define the 'times' function.
const times = (n, fn, context = undefined) => {
  let i = 0;
  while (fn.call(context, i) !== false && ++i < n) {}
};

// Define a variable to store the output.
var output = '';

// Use the 'times' function to execute a callback function for each iteration.
times(5, i => (output += i));

// Output the result.
console.log(output); // Output: "01234"

Output:

01234

Flowchart:

Live Demo:

See the Pen javascript-basic-exercise-127-1 by w3resource (@w3resource) on CodePen.

For more Practice: Solve these Related Problems:

• Write a JavaScript program that executes a callback function n times and returns an array of the results.
• Write a JavaScript function that uses a loop to iterate a callback a specified number of times, collecting outputs.
• Write a JavaScript program that simulates a for loop by invoking a function repeatedly for a given count.

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