JavaScript: Remove elements in an array until the passed function returns true
JavaScript fundamental (ES6 Syntax): Exercise-241 with Solution
Write a JavaScript program to remove elements in an array until the passed function returns true. Returns the remaining elements in the array.
- Loop through the array, using Array.prototype.slice() to drop the first element of the array until the value returned from func is true.
- Return the remaining elements.
Sample Solution:
JavaScript Code:
//#Source https://bit.ly/2neWfJ2
const dropWhile = (arr, func) => {
while (arr.length > 0 && !func(arr[0])) arr = arr.slice(1);
return arr;
};
console.log(dropWhile([1, 2, 3, 4], n => n >= 3));
Sample Output:
[3,4]
Flowchart:

Live Demo:
See the Pen javascript-basic-exercise-241-1 by w3resource (@w3resource) on CodePen.
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Previous: Write a JavaScript program that will return true if the parent element contains the child element, false otherwise.
Next: Write a JavaScript program to remove elements from the end of an array until the passed function returns true. Returns the remaining elements in the array.
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JavaScript: Tips of the Day
How to check whether a string contains a substring in JavaScript?
ECMAScript 6 introduced String.prototype.includes:
const string = "foo"; const substring = "oo"; console.log(string.includes(substring));
includes doesn't have Internet Explorer support, though. In ECMAScript 5 or older environments, use String.prototype.indexOf, which returns -1 when a substring cannot be found:
var string = "foo"; var substring = "oo"; console.log(string.indexOf(substring) !== -1);
Ref: https://bit.ly/3fFFgZv
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