Package Exports
- array.partial
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Readme
array.partial 
Like array.some but with exclusivity
Useful when you need to determine "partially" selected states - like partially selecting tree nodes when some but not all child nodes are checked.
In fact, the idea originated while building a feature for my own react-dropdown-tree-select component.
Why
array.some returns true when at least one element matches. array.every returns true when all elements match. array.some will also return true when array.every returns true.
array.partial is something in between. It returns true only, and only when some (but not all) elements match. If all elements match, then it'll return false.
This can also be achieved with array.some && !array.every if you don't mind iterating over the array twice. This module does it with one iteration over the array.
Install
npm install array.partialUsage
const partial = require('array.partial')
partial(array, callback)API
partial(array, callback)
array
Type: Array - Input array
callback
Type: Function - Function is a predicate, to test each element of the array. This is called with same arguments as array.filter
Examples
const partial = require('array.partial')
const myArr = [{id: 'a1', checked: true}, {id: 'a2', checked: false}]
partial(myArr, x => x.checked) // -> true
// ...
const myArr = [{id: 'a1', checked: true}, {id: 'a2', checked: true}]
partial(myArr, x => x.checked) // -> false
// ...
const myArr = [{id: 'a1', checked: false}, {id: 'a2', checked: false}]
partial(myArr, x => x.checked) // -> falseLicense
MIT © Hrusikesh Panda