Underscore.js _.matcher() Function

Last Updated : 15 Oct, 2020

Underscore.js is a JavaScript library that provides a lot of useful functions that helps in the programming in a big way like the map, filter, invoke etc. even without using any built-in objects.

The _.matcher() function is an inbuilt function in Underscore.js library of JavaScript which is used to find a predicate function which can inform you if a passed in object includes all the key-value properties that are given in the attrs parameter.

Syntax:

_.matcher(attrs)

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

  • attrs: It is the attribute which has a key and a value pair.

Return value: This method returns a predicate function.

Example 1:

JavaScript 
<!DOCTYPE html>
<html>

<head>
    <script type="text/javascript" src=
"https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.11.0/underscore.js"></script>
</head>

<body>
    <script type="text/javascript">
        console.log(_.matcher({ 
            picked: true, seeable: false 
        }));
    </script>
</body>

</html>

Output:

function(obj) { return isMatch(obj, attrs); }

Example 2:

JavaScript 
<!DOCTYPE html>
<html>

<head>
    <script type="text/javascript"
        src=
"https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.11.0/underscore.js"></script>
</head>

<body>
    <script type="text/javascript">
        var attr = "GeeksforGeeks";
        console.log(_.matcher(attr));
    </script>
</body>

</html>

Output:

function(obj) { return isMatch(obj, attrs); }

Reference: https://underscorejs.org/#matcher

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