daraxdray

// A binary tree is a tree data structure in which each node has at most two children, which are referred to as the left child and the right child.
// Left child is always less than it's parent and the right child is always bigger than it's parent.

class Node {
  constructor(value) {
    this.value = value;
    this.right = null;
    this.left = null;
  }
}

daraxdray

Group Array of JavaScript Objects by Key or Property Value

Implementation

const groupBy = key => array =>
  array.reduce((objectsByKeyValue, obj) => {
    const value = obj[key];
    objectsByKeyValue[value] = (objectsByKeyValue[value] || []).concat(obj);
    return objectsByKeyValue;