Leavify

A package to find object leaf values, compare changes of leaves by path, and reconstruct the "tree" object from its leaves.

Installation

npm install leavify

Usage

import leaves from 'leavify';

const oldState = {
  status: 'ok',
  id_codes: [1, 2, 3],
};

// Check if path refers to a leaf value
if (leaves.has(oldState, 'id_codes')) throw new Error();
if (!leaves.has(oldState, 'id_codes[0]')) throw new Error();

const newState = JSON.parse(JSON.stringify(oldState));
const changePath = 'id_codes[1]';

// Set and get leaf
leaves.set(newState, changePath, 0);
if (leaves.has(newState, changePath)) {
  const newCode = leaves.get(newState, changePath);
  console.log(newCode); // 0
}

// Find difference of objects by leaf path
const differentLeaves = leaves.findDifference(oldState, newState);
console.log(differentLeaves); // { 'id_codes[1]': 0 }

// Reconstruct tree from it's leaves
const tree = leaves.toTree(differentLeaves);
console.log(tree); // { id_codes: [ <1 empty item>, 0 ] }