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How to filter variables for data types such as arrays and objects? This article mainly uses filter()
to filter a large amount of data to obtain the required data.
1.filter() syntax:
var newArray = arr.filter(callback(element[, index[, array]])[,thisArg])
callback() is a function used to test each element of the array and returns The value that results in true:
element: The current element in the array.
index: The index of the current element in the array.
array: The array itself on which filter was called.
Return value: a filtered array
2. Example:
a. Filter the odd numbers in the array
arr5=[1,2,3,4,5]; res=arr5.filter( (item)=>item %2); console.log(res);
b. Filter the even numbers in the array
arr6=[1,2,3,4,5]; res=arr6.filter( (item)=>!(item %2)); console.log(res);
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