18.05.2017

Thursday.

JavaScript random

⟹JavaScript Random Integers

➡Math.random() used with Math.floor() can be used to return random integers.


➡ Math.floor(Math.random() * 10);     // returns a number between 0 and 9 

➡Math.floor(Math.random() * 11);      // returns a number between 0 and 10 

➡Math.floor(Math.random() * 100);     // returns a number between 0 and 99 

➡Math.floor(Math.random() * 101);     // returns a number between 0 and 100 

➡Math.floor(Math.random() * 10) + 1;  // returns a number between 1 and 10 

➡Math.floor(Math.random() * 100) + 1; // returns a number between 1 and 100

 

⟹A Proper Random Function

➡As you can see from the examples above, it might be a good idea to create a proper random function to use for all random integer purposes.

➡This JavaScript function always returns a random number between min (included) and max (excluded)

 function getRndInteger(min, max) {
    return Math.floor(Math.random() * (max - min) ) + min;
}


 function getRndInteger(min, max) {
    return Math.floor(Math.random() * (max - min + 1) ) + min;
}



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