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array.flatmap() is a built-in function in javascript that flattens input array elements into a new array. This method first maps each element using a mapping function and then flattens the input array elements into a new array. Let's take a look at the specific usage of flatMap().
The basic syntax of flatMap() is:
var A = array.flatMap(function callback(current_value, index, Array)) { //返回的新数组元素 }
callback: This is a new array with the help of three parameters A function that generates elements as follows:
current_value: It is the input array element.
index: This is optional. It is the index of the input element.
Array: This is optional. It is used when calling array mapping.
Let’s look at two specific examples
Example 1:
The code is as follows
The output result is:
[[3],[6],[9],[12],[15]] [3,6,9,12,15] [[3],[6],[9],[12],[ 15]
Example 2:
The code is as follows
The output result is: [3,6,9,12,15]
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