JavaScript in Operator
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JavaScript in Operator
The in operator returns a Boolean value indicates whether the specified property is in the specified object or its prototype chain.
Note: If you set a property to undefined but do not delete it, the in operator returns true for that property.
Example
HTML Online Editor
<!DOCTYPE html>
<html>
<body>
<p id="point"></p>
<script>
var x = document.getElementById("point");
var bike = {brand: "Honda", color: "red"};
if ("model" in bike === false)
bike.model = "cb1000r";
x.innerHTML = "Model : "+bike.model;
</script>
</body>
</html>
Syntax
property in object
Parameter Values
| Value | Type | Explanation |
|---|---|---|
| property | Required | A string representing a property name or array index. |
| object | Required | An object to check if it contains the property with specified name. |
Return Values
| Value | Explanation |
|---|---|
| true | If the specified property is in the specified object. |
| false | If the specified property is not in the specified object. |
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