The constructor property returns the constructor function for all JavaScript variables.
"John".constructor
// Returns function String() { [native code] }
(3.14).constructor
// Returns function Number() { [native code] }
false.constructor
// Returns function Boolean() { [native code] }
[1,2,3,4].constructor
// Returns function Array() { [native code] }
{name:'John', age:34}.constructor
// Returns function Object() { [native code] }
new Date().constructor
// Returns function Date() { [native code] }
function () {}.constructor
// Returns function Function(){ [native code] }
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