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.
What is the difficulty level of this exercise?
Test your Programming skills with w3resource's quiz.
- Weekly Trends
- Python Interview Questions and Answers: Comprehensive Guide
- Scala Exercises, Practice, Solution
- Kotlin Exercises practice with solution
- MongoDB Exercises, Practice, Solution
- SQL Exercises, Practice, Solution - JOINS
- Java Basic Programming Exercises
- SQL Subqueries
- Adventureworks Database Exercises
- C# Sharp Basic Exercises
- SQL COUNT() with distinct
- JavaScript String Exercises
- JavaScript HTML Form Validation
- Java Collection Exercises
- SQL COUNT() function
- SQL Inner Join