Скачать или смотреть foreach vs map in javascript

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sure! let's start with an explanation of `foreach` and `map` in javascript.

1. *`foreach`:*
the `foreach` method is used to iterate over an array and perform a function on each element in the array.
it does not return a new array but instead modifies the original array in place.
`foreach` is useful when you want to execute a function for each element of an array without needing to create a new array.

2. *`map`:*
the `map` method also iterates over an array, but it returns a new array with the results of calling a provided function on every element in the array.
it does not modify the original array but instead creates a new array based on the results of the provided function.
`map` is useful when you want to transform elements of an array and store the results in a new array.

here is an example to demonstrate the difference between `foreach` and `map`:



in the `foreach` example, we iterate over each element in the `numbers` array and push the squared value of each element into the `squarednumbers` array.

in the `map` example, we use the `map` method to create a new array (`doublednumbers`) by doubling each element in the `numbers` array.

in summary, use `foreach` when you need to perform an operation on each element of an array without creating a new array, and use `map` when you want to transform elements of an array and store the results in a new array.

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