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The knowledge of this article "JavaScript array iterative find and findIndex operation method" is not understood by most people, so the editor summarizes the following contents, detailed contents, clear steps, and has a certain reference value. I hope you can get something after reading this article. Let's take a look at this "JavaScript array iterative find and findIndex operation method" article.

Array.find ()

The find () method returns the value of the first array element that passes the test function.

This example finds (returns) the value of the first element greater than 18:

Example

Var numbers = [4, 9, 16, 25, 29]

Var first = numbers.find (myFunction)

Function myFunction (value, index, array) {

Return value > 18

}

Note that this function accepts three parameters:

Project value

Project index

The array itself

Array.findIndex ()

The findIndex () method returns the index of the first array element that passes the test function.

This example looks for the index of the first element greater than 18:

Example

Var numbers = [4, 9, 16, 25, 29]

Var first = numbers.findIndex (myFunction)

Function myFunction (value, index, array) {

Return value > 18

}

Note that this function accepts three parameters:

Project value

Project index

The array itself

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