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How to use every method

不言Original: 2019-01-31 17:48:485606browse

The every() method in How to use every method checks all elements in the array and executes the function. If the function returns false in any array loop and does not check the remaining elements, this loop exits. The array has no values and the every() method will not be executed. It also doesn't change the original array.

Let’s take a look at the specific usage of the every method

The basic syntax of the every method is as follows

array.every(function(currentValue, index, arr), thisValue)

Let’s look at an example

First we initialize an array named heights with some numeric elements. Then use the every() method to find if any array element is greater than 25

The code is as follows

<!DOCTYPE html>
<html>
   <head>
      <title></title>
      <meta charset="utf-8">
   </head>
   <body> 
<script type="text/javascript"> 
   
var heights = [15, 24, 33, 12];
 
function checkHeight(a) {
    return a >= 25;
}
 
var result = heights.every(checkHeight);
console.log(result);
</script> 
   </body>
</html>

The running result is displayed as: false

every() The method returns true or false based on whether each element in the array passes the condition given in the callback function.

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