JavaScript: Split values of two given arrays into two groups

JavaScript fundamental (ES6 Syntax): Exercise-17 with Solution

Split Array into Two Groups

Write a JavaScript program to split the values of two given arrays into two groups. If an element in the filter is true, the corresponding element in the collection belongs to the first group; otherwise, it belongs to the second group.

• Use Array.prototype.reduce() and Array.prototype.push() to add elements to groups, based on filter.
• If filter has a truthy value for any element, add it to the first group, otherwise add it to the second group.

Sample Solution:

JavaScript Code:

//#Source https://bit.ly/2neWfJ2 
// Define a function called `bifurcate` that splits an array into two groups based on a filter array.
const bifurcate = (arr, filter) =>
  arr.reduce((acc, val, i) => (acc[filter[i] ? 0 : 1].push(val), acc), [[], []]); // Split the array based on the filter array

// Example usage
console.log(bifurcate([1, 2, 3, 4], [true, true, false, true])); // [[1, 2, 4], [3]]
console.log(bifurcate([1, 2, 3, 4], [true, true, true, true])); // [[1, 2, 3, 4], []]
console.log(bifurcate([1, 2, 3, 4], [false, false, false, false])); // [[], [1, 2, 3, 4]]

Output:

[[1,2,4],[3]]
[[1,2,3,4],[]]
[[],[1,2,3,4]]

Flowchart:

Live Demo:

See the Pen javascript-basic-exercise-1-17 by w3resource (@w3resource) on CodePen.

For more Practice: Solve these Related Problems:

• Write a JavaScript program that splits an array into two groups based on a boolean filter array.
• Write a JavaScript function that separates elements into two arrays depending on whether a provided predicate function returns true or false.
• Write a JavaScript program that groups an array into two arrays based on a condition specified by a corresponding filter array.

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