JavaScript instanceof Operator
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JavaScript instanceof Operator
The instanceof operator returns a Boolean value indicates whether the prototype property of a constructor appears anywhere in the prototype chain of an object.
Example
HTML Online Editor
<!DOCTYPE html>
<html>
<body>
<script>
var num = new Number(36);
var str = new String("hello");
var bool = new Boolean(true);
var arr = [1, 2, 3];
var obj = {bike: "honda", color: "red"};
var txt = "";
txt += "num : "+ (num instanceof Number) + "<br>";
txt += "str : "+ (str instanceof String) + "<br>";
txt += "bool : "+ (bool instanceof Boolean) + "<br>";
txt += "arr : "+ (arr instanceof Array) + "<br>";
txt += "obj : "+ (obj instanceof Object) + "<br>";
document.write(txt);
</script>
</body>
</html>
Syntax
object instanceof constructor
Parameter Values
| Value | Type | Explanation |
|---|---|---|
| object | Required | The object to test. |
| constructor | Required | Function to test against. |
Return Values
| Value | Explanation |
|---|---|
| true | If the object is the instance of constructor. |
| false | If the object is not the instance of constructor. |
More Examples
Example
HTML Online Editor
<!DOCTYPE html>
<html>
<body>
<script>
function bike(brand, model, color){
this.brand = brand;
this.model = model;
this.color = color;
}
var honda = new bike("Honda", "CB1000R", "Red");
document.write(honda instanceof bike);
</script>
</body>
</html>
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