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This article is about how to use the filter method in the js array. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

1. Filter returns a new array of all the elements that are tested by providing a function.

2. Filter does not change the original array and returns the new array.

3. Before calling callback for the first time, the range of elements for filter traversal has been determined.

Example

Array.prototype._filter = function (callback) {let res = [] for (var iTuno)

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