Underscore.js _.memoize() Function

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The _.memoize() function is used to memorize a given function by caching the result computed by the function. It is used to speed up for the slow running process.

Syntax:

_.memoize(function, [hashFunction])

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

function: The function that need to be executed.
hashFunction: It is an optional parameter. The hashFunction is used to compute the hash key for storing the result.

Return Value: It returns the result of the called function.

Below examples illustrate the _.memoize function in Underscore.js:
Example 1:

<!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 fib = _.memoize(function (n) { 
            return n < 2 ? n : fib(n - 1) + fib(n - 2); 
        }); 
  
        console.log(fib(15)); 
    </script> 
</body> 
  
</html> 

Output:

Example 2:

<!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 sum = _.memoize(function (n) { 
            return n < 1 ? n : n + sum(n - 1); 
        }); 
  
        console.log('Sum of first 10 natural number: ' + sum(10)); 
    </script> 
</body> 
  
</html> 

Output:

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