​x
 
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<!DOCTYPE html>
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<html lang="en">
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    <head>
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      <meta charset="UTF-8">
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      <title>Built-in length property</title>
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    </head>
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    <body>
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      <script>
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       let colors = ["black", "orange", "pink"];
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       let fruits = ["Apple", "Orange", "Banana", "Orange"];
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​
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       document.write("Length of colors:  " + colors.length);
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       document.write("Length of fruits:  " + fruits.length);     
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      </script>   
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    </body>
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</html>