Underscore.js _.random() Function

0 0 1 minute read

Underscore.js is a library in javascript that makes operations on arrays, string, objects much easier and handy.
The _.random() function is used to return a random integer which is in the range provided to the function.

Note: It is very necessary to link the underscore CDN before going and using underscore functions in the browser. When linking the underscore.js CDN The “_” is attached to the browser as a global variable.

Syntax:

_.random(min, max);

Parameters: It takes the following parameters.

min value: It is the minimum random value to be returned by the function.
max value: It is the maximum random value that can be returned by the function.

Return Value: It returns a random integer between the min and max. If only one value is passed then it will return random value between 0 and passed value.

Example 1:

<!DOCTYPE html> 
<html> 
  
<head> 
    <script src= 
"https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.9.1/underscore-min.js"> 
    </script> 
</head> 
  
<body> 
    <script> 
        let min = 5; 
        let max = 10; 
  
        // Printing 5 random values 
        // in range 5 and 10 
        for (let i = 0; i < 5; i++) { 
            console.log(_.random(min, max)); 
        } 
    </script> 
</body> 
  
</html> 

Output:

Example 2: If no parameter is given to the random function.

<!DOCTYPE html> 
<html> 
  
<head> 
    <script src= 
"https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.9.1/underscore-min.js"> 
    </script> 
</head> 
  
<body> 
    <script> 
  
        // Without passing any  
        // value to function 
        console.log(_.random()) 
    </script> 
</body> 
  
</html> 

Output:

Example 3: When only one parameter is given then random value is in range 0 to n, where n is the parameter given.

<!DOCTYPE html> 
<html> 
  
<head> 
    <script src= 
"https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.9.1/underscore-min.js"> 
    </script> 
</head> 
  
<body> 
    <script> 
        console.log(_.random(10)) 
        console.log(_.random(5)) 
        console.log(_.random(8)) 
    </script> 
</body> 
  
</html> 

Output:

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