Underscore.js _.matcher() Function

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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 = "zambiatek"; 
        console.log(_.matcher(attr)); 
    </script> 
</body> 
  
</html> 

Output:

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

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

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