Underscore.js _.mapObject() Function

Last Updated : 25 Nov, 2021

The _.mapObject() function is similar to the map but used for the object. This function transforms each value of the object based on the given function/operation. Syntax:

_.mapObject(object, iteratee, [context])

Parameters: This function accepts three parameters as mentioned above and described below:

object: It contains the object element that holds the elements of key and value pair.
iteratee: It is the function which is used to take all the elements of the list and it also remember all the returned value.
context: This parameter is used to display the content.

Return Value: It returns the transform value of each object element. Example 1:

html

<!DOCTYPE html>
<html>

<head>
    <script type="text/javascript" 
            src=
"https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.9.1/underscore-min.js">
    </script>
</head>

<body>
    <script type="text/javascript">

        var res = _.mapObject({ num1: 10, num2: 15 },
            function (value, key) {
                return value * 10;
            });

        console.log(res);
    </script>
</body>

</html>

Output:

Example 2:

html

<!DOCTYPE html>
<html>

<head>
    <script type="text/javascript" 
            src=
"https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.9.1/underscore-min.js">
    </script>
</head>

<body>
    <script type="text/javascript">

        _.mapObject({ num1: 10, num2: 15, num3: 20, num4: 25, num5: 30 },

            function (value, key) {
                console.log(key + ': ' + (value + 10));
            });
    </script>
</body>

</html>