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<!DOCTYPE html> <html> <body> <p>The constructor property returns the constructor function for a variable or an object.</p> <p id="demo"></p> <script> document.getElementById("demo").innerHTML = "john".constructor + "<br>" + (3.14).constructor + "<br>" + false.constructor + "<br>" + [1,2,3,4].constructor + "<br>" + {name:'john', age:34}.constructor + "<br>" + new Date().constructor + "<br>" + function () {}.constructor; </script> </body> </html>