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How to use isArray function

不言Original: 2019-02-21 11:02:212938browse

The Array.isArray() function is used to determine whether the value passed to this function is an array. This function returns true if the passed argument is an array, false otherwise. Let's take a look at the specific use of the isArray function.

First let’s take a look at the basic syntax of the isArray function

Array.isArray(obj)

obj is any valid object in How to use isArray function, such as map , list, array, string, etc.

Let’s look at a few specific examples

Example 1:

The code is as follows

<!DOCTYPE html>
<html>
<head>
  <title></title>
</head>
<body>
<script> 
function func() { 
    document.write(Array.isArray([&#39;Day&#39;,&#39;Night&#39;,&#39;Evening&#39;])); 
} 
func(); 
</script> 
</body>
</html>

The output result is: true

Example 2:

The code is as follows

<!DOCTYPE html>
<html>
<head>
  <title></title>
</head>
<body>
<script> 
function func() { 
    document.write(Array.isArray({foo: 123})); 
} 
func(); 
</script> 
</body>
</html>

The output result is as follows: false

Example 3:

The code is as follows

<!DOCTYPE html>
<html>
<head>
  <title></title>
</head>
<body>
<script> 
function func() { 
    document.write(Array.isArray(&#39;foobar&#39;)); 
} 
func(); 
</script>
</body>
</html>

Output The result is: false

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