JavaScript: Get removed elements of an given array until the passed function returns true

JavaScript fundamental (ES6 Syntax): Exercise-128 with Solution

Write a JavaScript program to get removed elements of an given array until the passed function returns true.

• Loop through the array, using a for...of loop over Array.prototype.entries() until the returned value from the function is falsy.
• Return the removed elements, using Array.prototype.slice().
• The callback function, fn, accepts a single argument which is the value of the element.

Sample Solution:

JavaScript Code:

//#Source https://bit.ly/2neWfJ2 
const takeWhile = (arr, func) => {
  for (const [i, val] of arr.entries()) if (func(val)) return arr.slice(0, i);
  return arr;
};

console.log(takeWhile([1, 2, 3, 4], n => n >= 3));

Sample Output:

[1,2]

Flowchart:

Live Demo:

See the Pen javascript-basic-exercise-128-1 by w3resource (@w3resource) on CodePen.

Improve this sample solution and post your code through Disqus

Previous: Write a JavaScript program to iterate over a callback n times.
Next: Write a JavaScript program to get removed elements from the end of an given array until the passed function returns true.