Permutations in JavaScript?

Question

I\'m trying to write a function that does the following:

• takes an array of integers as an argument (e.g. [1,2,3,4])
• creates an array of all the possib

Answer 1

I wrote a post to demonstrate how to permute an array in JavaScript. Here is the code which does this.

var count=0;
function permute(pre,cur){ 
    var len=cur.length;
    for(var i=0;i1){
            permute(p,c);
        }else{
            print(p);
            count++;
        }
    }
}
function print(arr){
    var len=arr.length;
    for(var i=0;i");
}
function remove(arr,item){
    if(contains(arr,item)){
        var len=arr.length;
        for(var i = len-1; i >= 0; i--){ // STEP 1
            if(arr[i] == item){             // STEP 2
                arr.splice(i,1);              // STEP 3
            }
        }
    }
}
function contains(arr,value){
    for(var i=0;i

Just call

permute([], [1,2,3,4])

will work. For details on how this works, please refer to the explanation in that post.