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This article mainly introduces the JavaScript array iteration every and some of the operation methods related knowledge, detailed and easy to understand, simple and fast operation, with a certain reference value, I believe that everyone will read this JavaScript array iteration every and some of the operation methods of the article will have some gains, let's take a look at it.

Array.every（）

The every () method checks whether all array values pass the test.

This example checks if all array values are greater than 18:

examples

var numbers = [45, 4, 9, 16, 25];

var allOver18 = numbers.every（myFunction）;

function myFunction（value, index, array） {

return value > 18;

}

Note that this function takes three parameters:

item value

item index

array itself

If the callback function uses only the first parameter (value), the other parameters can be omitted:

examples

var numbers = [45, 4, 9, 16, 25];

var allOver18 = numbers.every（myFunction）;

function myFunction（value） {

return value > 18;

}

Array.some（）

Some () methods check whether certain array values pass the test.

This example checks if certain array values are greater than 18:

examples

var numbers = [45, 4, 9, 16, 25];

var someOver18 = numbers.some（myFunction）;

function myFunction（value, index, array） {

return value > 18;

}

Note that this function takes three parameters:

item value

item index

array itself

All browsers support Array.some (), except Internet Explorer 8 or earlier.

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