How to implement the factorial of n using javascript

Use JavaScript to implement the factorial of n: 1. Use while loop, code such as "while(num){result *= num;num--;}"; 2. Use function recursion, code such as " if(num <= 0){return 1;}else{...}".

The operating environment of this article: windows7 system, javascript1.8.5 version, Dell G3 computer.

How to use javascript to implement the factorial of n?

Two methods to implement n factorial in javascript

Option 1: Using while loop

function factorial(num){
var result = 1;
while(num){
result *= num;
num--;
}
return result;
}

Option 2: Using function recursion

function factorial(num){
if(num <= 0){
return 1;
}else{
return num*arguments.callee(num-1);
}
}

Recommended Study: "javascript basic tutorial"

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