Creates a lodash object which wraps value to enable implicit chaining. The _.keys() function returns an array of the property names of the JavaScript object and the _.values() function returns an array of their values. Gets the size of the collection by returning collection.length for arrays and array-like objects or the number of own enumerable properties for objects. The _.groupBy method creates a dictionary type object, from which I use the _.map method to get the first items of each (already ordered) groups in an array format. (*): Returns the found element, else undefined. (boolean): Returns true if the value is an object, else false. (Function): Returns the new debounced function. (number): Returns the index of the matched value or -1. The course will help you to learn Lodash step by step from the very beginning to pro. If a callback function is provided elements at the beginning of the array are excluded from the result as long as the callback returns truey. The year was also one of collaboration, as discussions began on merging Lodash & Underscore.Much of Lodash v4 is proofing out the ideas from those discussions. If _.keyBy is used, then all values will be objects. There are lots of quizzes from real usecases for you to try using Lodash on you own. If isShallow is truey, the array will only be flattened a single level. @Akrikos the _.keyBy will transform the entire array to an object, whereas the question is mostly about having one item from each object in array as key and one other item as its value. The callback is bound to thisArg and invoked with one argument; (value). Enables explicit method chaining on the wrapper object. (boolean): Returns true if the value is a function, else false. The result cache is exposed as the cache property on the memoized function. Creates a function that, when called, invokes func with the this binding of thisArg and prepends any additional bind arguments to those provided to the bound function. Methods that operate on and return arrays, collections, and functions can be chained together. Creates a function that, when executed, will only call the func function at most once per every wait milliseconds. Settings for which the user didn't provide a value should fall back to a reasonable default. If resolver is provided it will be used to determine the cache key for storing the result based on the arguments provided to the memoized function. Subsequent sources will overwrite property assignments of previous sources. If a callback is provided it will be executed for each value in the collection to generate the criterion by which the value is ranked. (Array): Returns a duplicate-value-free array. The callback is bound to thisArg and invoked with one argument; (value).Note: This method is loosely based on the structured clone algorithm. (Array): Returns a new array of elements that passed the callback check. Creates an array excluding all provided values using strict equality for comparisons, i.e. (number): Returns the index at which value should be inserted into array. The corresponding value of each key is an array of the elements responsible for generating the key. Creates a function that provides value to the wrapper function as its first argument. Assigns own enumerable properties of source object(s) to the destination object for all destination properties that resolve to undefined. It can also be used to find an Object in an array of objects also. A collection is an object that contains iterable elements. Checks if value is an object created by the Object constructor. share | improve this question | follow | edited Dec 8 '17 at 9:13. (boolean): Returns true if the target element is found, else false. (boolean): Returns true if the value is an array, else false. Assigns own enumerable properties of source object(s) to the destination object. If no method names are provided all the function properties of object will be bound. The callback is bound to thisArg and invoked with three arguments; (value, index, array).If a property name is provided for callback the created ".pluck" style callback will return the property value of the given element.If an object is provided for callback the created ".where" style callback will return true for elements that have the properties of the given object, else false. (Array): Returns the random sample(s) of collection. Property access in Javascript can be problematic - especially when dealing with nested Objects and Arrays. The corresponding value of each key is the last element responsible for generating the key. Thanks to flexibility and extensibility of Lodash, we made it, by writing only few lines of code. : Gets the first element or first n elements of an array. (Array): Returns a new array of elements that failed the callback check. 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