JavaScript Object propertyIsEnumerable() Method

The propertyIsEnumerable() method returns a Boolean indicating whether the specified property is enumerable and is the object’s own property. The propertyIsEnumerable() method returns false if the object doesn’t have the specified property.

Syntax:

obj.propertyIsEnumerable(prop)

Parameters: This method accepts a single parameter.

• prop: The name of the property to test.

Return value: This method returns a boolean value.

Example 1: This example shows the basic use of the JavaScript Object.prototype.propertyIsEnumerable() method.

javascript

<script>
    const obj = {};
    const arr = [];
    obj.property = 42;
    arr[0] = 42;

    console.log(obj.propertyIsEnumerable('property'));
    console.log(arr.propertyIsEnumerable(0));
    console.log(arr.propertyIsEnumerable('length'));
</script>

Output:

true
true
false

Example 2: The following example illustrates the enumerability of user-defined vs. built-in properties:

javascript

<script>
    let a = ['is enumerable'];

    console.log(a.propertyIsEnumerable(0));
    console.log(a.propertyIsEnumerable('length'));

    console.log(Math.propertyIsEnumerable('random'));
    console.log(this.propertyIsEnumerable('Math'));
</script>

Output:

true
false
false
false

We have a complete list of Javascript Object Methods, to check those please go through the Javascript Object Complete Reference article.

Supported Browser:

• Chrome 1 and above
• Edge 12 and above
• Firefox 1 and above
• Internet Explorer
• Opera 4 and above
• Safari 3 and above