JavaScript: Filter out the specified values from a specified array

JavaScript fundamental (ES6 Syntax): Exercise-8 with Solution

Filter Specified Values from Array

Write a JavaScript program to filter out the specified values from a specified array. Return the original array without filtered values.

• Use Array.prototype.filter() and Array.prototype.includes() to pull out the values that are not needed.
• Set Array.prototype.length to mutate the passed in an array by resetting its length to 0.
• Use Array.prototype.push() to re-populate it with only the pulled values.

Sample Solution:

JavaScript Code:

//#Source https://bit.ly/2neWfJ2 
 
// Define a function called `pull` that takes an array `arr` and any number of values `args`.
const pull = (arr, ...args) => {
  // Convert the rest parameters into an array.
  let argState = Array.isArray(args[0]) ? args[0] : args;
  // Filter out elements from the array that are not included in the `args`.
  let pulled = arr.filter((v, i) => !argState.includes(v));
  // Clear the original array and push the filtered elements back into it.
  arr.length = 0;
  pulled.forEach(v => arr.push(v));
  // Return the pulled elements.
  return pulled;
};

// Test cases
let arra1 = ['a', 'b', 'c', 'a', 'b', 'c'];
console.log(pull(arra1, 'a', 'c')); // Output: ['b', 'b']
let arra2 = ['a', 'b', 'c', 'a', 'b', 'c'];
console.log(pull(arra2, 'b')); // Output: ['a', 'c', 'a', 'c']

Output:

["b","b"]
["a","c","a","c"]

Visual Presentation:

Flowchart:

Live Demo:

See the Pen javascript-basic-exercise-1-8 by w3resource (@w3resource) on CodePen.

For more Practice: Solve these Related Problems:

• Write a JavaScript program that filters out all occurrences of specified values from an array.
• Write a JavaScript function that removes multiple given values from an array and returns the filtered array.
• Write a JavaScript program that accepts an array and a set of values to exclude, then returns the array without those values.

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