has-deep-value
Very small (only 179 bytes), lightweight, tested and dependency free utility function to (deeply) inspect Javascript objects. With has-deep-value you can easily check if any object contains a given property at any level deep, accounts for falsey values too. Also includes a curried version and supports object path (dot notation) to keep api usage clear.
Install
$ npm install --save has-deep-value
Usage
Note: use .hasDeepValue for the normal function and .has for the curried version
const hasDeepValue = require('has-deep-value').hasDeepValue;
hasDeepValue({ hello: 'world' }, 'hello'); //-> true
Accounts for all values, including all falsey values, e.g.:
''
false
NaN
0
undefined
null
Typescript
Included is an index.d.ts
file, Typescript should automatically pick this file up and apply the typings across your codebase.
import { hasDeepValue, has } from "has-deep-value";
hasDeepValue({ hello: "world" }, "hello"); //-> true
has("hello.world")({ hello: { world: "" } }); //-> true
Examples
Default
hasDeepValue({ hello: 'world' }, 'hello'); //-> true
hasDeepValue({ hello: { world: '' } }, 'hello.world'); //-> true
hasDeepValue({ hello: { world: { deep: null } } }, 'hello.world.deep'); //-> true
hasDeepValue({ hello: { world: { deep: () => 100; } } }, 'hello.world.deep'); //-> true
hasDeepValue({ hello: { world: '' } }, 'hello.world.deep'); //-> false
hasDeepValue('', ''); //-> false
hasDeepValue(undefined, 'undefined'); //-> false
hasDeepValue(false, 'false'); //-> false
hasDeepValue(null, 'null'); //-> false
hasDeepValue(0, 'hello'); //-> false
hasDeepValue(NaN, 'world'); //-> false
hasDeepValue(() => {}, 'f'); //-> false
Functional
const has = require('has-deep-value').has;
const hasHelloWorld = has('hello.world');
hasHelloWorld({ hello: { world: '' } }); //-> true
hasHelloWorld({ helloworld: '' }); //-> false
// Etc... the same usage of the default case
const objects = [{...}, {...}, {...}];
// Check if all objects conform to { hello: { world: '' } }
if (objects.map(hasHelloWorld).every(e => e)) {
...
}
// A different example
if (objects.map(has('account.profile.image')).every(e => e)) {
...
}
License
Copyright © 2018-2021, Alex Burghardt. Made available under the MIT license.