Getting the values for a specific key from all objects in an array

You could map:

permittedValues = array.map(function(value) {  return value.key;});

In ES6/ES2015 it's even prettier with arrow functions:

permittedValues = array.map(value => value.key);

It might be prettier, but it's probably not faster than a for() loop.

javascript json node.js express

Using lodash,

Since lodash 4.x the _.pluck function has been removed in support to map function.

so you can achieve the desired task by:

import _ from 'lodash'_.map(items, 'key');

javascript json node.js express

Pure Javascript ES6

array.map(value => value.key);

Underscore/Lodash

_.map(value,'key')

CodeHunter