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<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>JavaScript delete array element</title> </head> <body> <pre> <!-- Use pre element for work document.writeln() method --> <script type="text/javascript"> // Press F12 - View result on Console Panel var domain = new Array(".com", ".net", ".org", ".gov"); domain[4] = ".int"; // add new array element document.writeln( domain ); delete domain[4]; // return true document.writeln( domain[4] ); // undefined document.writeln( domain ); document.writeln( "length: " + domain.length ); // length 5 console.log( domain ); // console - [".com", ".net", ".org", ".gov", undefined × 1] </script> </pre> </body> </html>