collection (Array|Object): The collection to iterate over. Now it's time to go build something extraordinary! The above examples all seem be to doing this from an array of objects where the key is a property of that object. Essentially, "Given an array of keys, calculate some value for each and return an indexed object". One demand is to return all these elements without any duplicates and they should be sorted by timestamp. Often times your code knows when a key might have dots in it, in which case you can pass an array of keys instead of a string. How to do radius based filteration query in firebase data? Utility libraries like Lodash and jQuery also have helpful methods to make traversing array and object values … Ionic 2 - how to make ion-button with icon and text on two lines? If the predicate returns a falsy value (like null, undefined, 0, or ''), Lodash filters that value out. var users = [{ id: 12, name: Adam },{ id: 14, name: Bob },{ id: 16, name: Charlie },{ id: 18, name: David } ] // how do I get [12, 14, 16, 18] var userIds = _.map(users, _.pick('id')); So there is also the lodash pick method that works more or less the same way but by giving an array or properties that are to be picked for the new object from the given object rather than omitting properties. In Go language, a channel is a medium through which a goroutine communicates with another goroutine. I have an array of elements. Simple lodash.get function in javascript. 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Lodash is a JavaScript library that works on the top of underscore.js. Simple lodash.get function in javascript. 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Update 2: As Mark points out in the comments, somewhere between Lodash v4 and 4.3, a new function has been added that provides this functionality again. 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