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Underscore.js | _.defaults() Function
  • Last Updated : 27 Apr, 2020

The _.defaults() function returns the object after filling in its undefined properties with the first value present in the following list of default objects.

Syntax:

_.defaults(object, *defaults)

Parameters: This function accepts two parameter as mentioned above and described below:

  • object: This parameter holds the value of an object.
  • defaults: It is an optional parameter. It contains the [key, value] pair of an object.

Return Value: It returns the object after filling in its undefined properties with the first value present in the following list of default objects.

Example 1:






<!DOCTYPE html>
<html>
  
<head>
    <script type="text/javascript" src=
    </script>
</head>
  
<body>
    <script type="text/javascript">
  
        var info = {
            Company: 'GeeksforGeeks',
            Address: 'Noida',
            Contact: '+91 9876543210'
        };
  
        console.log(_.defaults(info,
            {
                Contact: '+91 9898989898',
                Name: 'Rakesh'
            })
        );
    </script>
</body>
  
</html>

Output:

Example 2:




<!DOCTYPE html>
<html>
  
<head>
    <script type="text/javascript" src=
    </script>
</head>
  
<body>
    <script type="text/javascript">
  
        var info = {
            Company: 'GeeksforGeeks',
            Address: 'Noida',
            Contact: '+91 9876543210'
        };
  
        var def = {
            Name: 'Ashok',
            Age: '34',
            Company: 'GFG'
        }
  
        console.log(_.defaults(info, def));
    </script>
</body>
  
</html>

Output:




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