Set query string style fields on an object.

Installation

npm install q-set

import { deep, shallow } from 'q-set';

API

qset.deep(obj: any, path: string, val: any): any

• Sets nested paths such as a[b][c].
• Concats duplicated properties on an object as an array.
• Supports [] as array push and will be appended to an existing array or create a new one.

import { deep as set } from 'q-set'

// Set a key.
set({}, "a", 1); //-> { a: 1 }

// Set a nested path.
set({}, "a[b]", 1); //-> { a: { b: 1 } }

// Implicit array creation (keys used multiple times).
const obj = {};
set(obj, "a", 1); //-> { a: 1 }
set(obj, "a", 2); //-> { a: [1, 2] }

// Explicit array creation.
const obj = {};
set(obj, "a[]", 1); //-> { a: [1] }
set(obj, "a[]", 2); //-> { a: [1, 2] }

// Will also automatically create an array when the a key is a positive integer.
const obj = {};
set(obj, "a[0]", 1); //-> { a: [1] }
set(obj, "a[1]", 2); //-> { a: [1, 2] }
set({}, "b[2]", 3); //-> { b: [,,3] }

// Nested array creation.
const obj = {};
set(obj, "a[][b]", 1); //-> { a: [{ b: 1 }] }
set(obj, "a[][b]", 2); //-> { a: [{ b: 1 }, { b: 2 }] }

qset.shallow(obj: any, path: string, val: any): any

• Concats duplicated properties on an object as an array.
• Will not follow nested query strings.
• If [] is used it will be converted to an explicit index and flattened.

import { shallow as set } from 'q-set'

// Doesn't unflatten qs syntax but does append to arrays.
const obj = {};
set(obj, "a[1]", 1); //-> { "a[1]": 1 }
set(obj, "a[1]", 2); //-> { "a[1]": [1, 2] }

// Automatically converts array push "[]" to indexes.
const obj = {};
set(obj, "a[]", 1); //-> { "a[0]": 1 }
set(obj, "a[]", 2); //-> { "a[0]": 1, "a[1]": 2 }

Contributions

• Use npm test to build and run tests.

Please feel free to create a PR!