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Lodash _.wrapperFlatMap

Overview

The _.wrapperFlatMap method is a utility function in the Lodash library that creates a new chainable wrapper object that flattens the result of invoking the given iteratee for each element in a collection. This method is used to transform arrays, objects, or strings into a flat version of themselves by applying a mapping function that returns an array. The resulting flat array is then returned by combining all the arrays returned by the iteratee.

The method takes two parameters: the first is the collection to iterate over, and the second parameter is the iteratee that transforms the data. The iteratee can be a function, an object, or a string. If it is a function, it is invoked for each element in the collection with three arguments: the current value, its index, and the entire collection. If it is an object, it is used as a matching condition and is compared with each element in the collection. If a string is specified, it will be used as a property name to enable deep property access.

The returned value of the iteratee should be an array or should be able to be flattened into an array. The method then flattens the resulting array using _.flattenDeep(), which recursively flattens nested arrays. The resulting flat array is then wrapped in a new chainable wrapper object and can be used in a chainable manner with other Lodash methods.

The _.wrapperFlatMap method is useful for situations where a nested collection needs to be transformed and flattened in one step, such as converting a nested array of objects to a flat array of specific properties. By using this method, developers can write more concise code and avoid multiple nested loops and array flattening functions.

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