T and returns Observable . The flatMap() method is a combination of flat() and map() methods. flatMap() Parameters. A value to be passed to the function to be used as its "this" value. Jump to section Jump to section. (For example: passing a nested array) So if the referenced object is modified, the changes are visible in the returned new array.It copies the value of strings and numbers to the new array. var randomList = [1, 2, 3]; var randomNestedList = [ [4, … Scala | flatMap() Method: Here, we will be going to learn about flatMap() method in Scala with syntaxes and examples based on working. Syntax; Alternatives; Examples; Specifications; Browser compatibility; See also; The flat() method creates a new array with all sub-array elements concatenated into it recursively up to the specified depth. Instead of calling 2 methods, just use flatMap() These methods are fairly new and only works in the latest versions of modern browsers, and Node.js 11 and higher. Syntax Create new account Log in About … In Scala flatmap method is used on the collection and data structures of scale, as the name suggests it is the combination of two things methods i.e. array.flatMap. JavaScript Array flatMap() Method. The array.flatMap() is an inbuilt function in JavaScript which is used to flatten the input array element into a new array. Javascript Object Oriented Programming Web Development Front End Technology The array.flatMap() method of JavaScript is used to flatten the input array element into a new array. [[1], [2,3]].flatMap(x => x) This results in output: [1, 2, 3] Map, flatMap and the 1 to 1 vs 1 to many outputs. Basically if Observable denotes an observable object which pushes values of type T, then flatMap takes a function of type T' -> Observable as its argument, and returns Observable. The flatMap() method first maps each element using a mapping function, then flattens the result into a new array. It’s equivalent to calling map on an array followed by flat with depth 1. Array.flatMap() The flatMap method maps an array’s entries into another array and then flatten the results. The flatMap… This is an experimental technology Check the Browser compatibility table carefully before using this in production. Log in Create account DEV is a community of 457,801 amazing developers We're a place where coders share, stay up-to-date and grow their careers. That is the behaviour of flatMap when compared to map : Execute the given function and flatten the resulting object into a stream. It combines the steps of first mapping over the array with map() & then calling flat(). JavaScript . The syntax is as follows − In this lesson, we'll investigate a common use case for mapping and filtering an array in a single iteration. View all tutorials Reference Materials. Here’s an example: It copies object references to the new array. 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