callback-pluck

callback-pluck

Use callback-pluck instead of _.pluck

Callback pluck is a callback generator with clean API for ES5 iterations methods. It allows you to use _.pluck idea in more clean way via generating required callbacks for iteration methods (map, filter, every and some).

Deprecation note

Use es6 arrow functions instead, they are native and simpler solution.

arr.map(p('age'));    // [36, 40, 22, 22]
arr.map(i => i.age);  // [36, 40, 22, 22]

Install

npm install --save-dev callback-pluck

Usage

var p = require('callback-pluck');
var arr = [
  { 'name': 'Barney',  'age': 36, sex: 'male', married: true },
  { 'name': 'Fred',    'age': 40, sex: 'male', married: true },
  { 'name': 'Glenn',   'age': 22, sex: 'male', married: false },
  { 'name': 'Stephen', 'age': 22, sex: 'male', married: true }
];

Callback pluck with [ ].map

arr.map(p('name')); // ['Barney', 'Fred', 'Glenn', 'Stephen']
arr.map(p('age'));  // [36, 40, 22, 22]

Callback pluck with [ ].filter

Simple filtering with string parameter:

arr.filter(p('married')); // [{ 'name': 'Barney',  …, married: true },
                          //  { 'name': 'Fred',    ¬, married: true },
                          //  { 'name': 'Stephen', …, married: true }]

Simple filtering with string parameter and additional false parameter:

arr.filter(p('married', false)); // { 'name': 'Glenn', …, married: false },

Advanced filtering via property value:

arr.filter(p({ age: 22  })); // [{ 'name': 'Glenn',   'age': 22, … },
                             //  { 'name': 'Stephen', 'age': 22, … }]

Advanced negative filtering via property value and additional false parameter:

arr.filter(p({ age: 22 }, false)); // [{ 'name': 'Barney',  'age': 36, … },
                                   //  { 'name': 'Fred',    'age': 40, … }]

Callback pluck with [ ].every

arr.every(p('married')); // false
arr.every(p({ sex: 'male' })); // true
arr.every(p({ married: true })); // false

Callback pluck with [ ].some

arr.some(p('married')); // true
arr.some(p({ married: true })); // true
arr.some(p({ name: 'Barney' })); // true
arr.some(p({ sex: 'female' })); // false

Note

Advanced filtering via property value doesn't do deep equal, It take only first property from Object.keys(inputObject) to keep logic clean and simple.

License

MIT © Vladimir Starkov