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deep-assign-lite

v1.0.0

Published

Recursive object assign tool that focuses on quick-and-dirty way to handle options object in constructor or init process

Downloads

1

Readme

deepAssign lite

Recursive object assign tool that focuses on quick-and-dirty way to handle options object in constructor or init process.

This is basically a remake of jQuery.extend(). So this inherits the same characterisics from it.

  • The function only deep-copies if property's value is a plain object or an array.
  • The function does not merge objects/arrays set to the same property in the from and to objects, but overwrites to's value with the deep-copy of from's value.

Install

npm install --save-dev deep-assign-lite

Usage

// import as node module
const deepAssign = require('deep-assign-lite');

// or import as ES6 module
import deepAssign from '.../node_modules/deep-assign-lite/deepAssign.js';


const from = {
  foo: { x: 12, y: 34, z: ['i', 'j', 'k'] },
  bar: [ 'a', 'b', {c: 1, d: false} ],
  bam: () => {},
};
const to = {
  foo: {a: 0, b: 1},
  bar: [123, 456],
  baz: 'xyz',
};

const result = deepAssign(to, from);
// `result`` will be `to` itself with the properties copied from `from`:
{
  foo: { x: 12, y: 34,  z: ['i', 'j', 'k'] },  //=> deep copy of from.foo
  bar: [ 'a', 'b', {c: 1, d: false} ],         //=> deep copy of from.bar
  baz: 'xyz',
  bam: () => {},                               //=> shallow copy of from.bar
}

// Just like Object.assign and jQuery.extend, you can pass multiple `from` objects
const target = {};
const src1 = { foo: 123 },
const src2 = { bar: 456, baz: 789 };
const src3 = { bar: ['a', 'b'], bam: {x: 0, y: 0} };

deepAssign(target, src1, src2, src3);
// `target`` will be:
{
  foo: 123,
  bar: ['a', 'b'],
  baz: 789,
  bam: {x: 0, y: 0},
}

License