How to find factorial in javascript

How to find the factorial in javascript: 1. Use a while loop to find the factorial of a specified number; 2. Use a function to recursively find the factorial of a specified number. The code is like "function factorial(num){var result=1... }".

The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.

JS implementation example of factorial operation for finding 5.

Option 1: Using while loop

function factorial(num){
  var result = 1;
  while(num){
    result *= num;
    num--;
  }
  return result;
}
console.log(factorial(5))//120

Running result:

Option 2: Using function recursion

function factorial(num){
  if(num <= 0){
    return 1;
  }else{
    return num*arguments.callee(num-1);
  }
}
console.log(factorial(5))//120

Running result:

[Recommended Study: js basic tutorial】

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