The typical use case is to execute side effects at the end of a chain. Unlike map (), forEach () always returns undefined and is not chainable. It calls a provided callbackFn function once for each element in an array in ascending-index order. You can imagine that the key-value pairs of the object we passed as the secondĪrgument to Object.assign(), get copied into the object we supplied for theįirst argument. Each key in an object must be unique, but the values can be of any data type, including other objects, arrays, and functions. The forEach () method is an iterative method. the source object(s) - one or more objects that contain the properties we.the target object - the object to which the provided properties will be.Using Object. We used the Object.assign() method to copy the key-value pairs of one or more Using Object.keys with forEach in JavaScript Another popular method for getting keys and values as an iterable from an object in JavaScript is with Object.keys and.
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