Calculate how many unique absolute numbers are in an array of numbers

UniqueAbsolute

/*
  Find the total amount of absolute values
*/


function huntBats(b){
    console.log(b + "  = ");
    function detect(b){
	for( var i = 0 ; i < b.length ; i++ ){
	    if( b[i]<0) b[i] = b[i] * -1; //normalize
	    for( var j = i+1; j < b.length; j++){
		if( b[j] < 0 ) b[j] = b[j] * -1; //normalize
		if( b[j] === b[i] )  b.splice(j,1);
	    }
	}
	return b;
    }
    b0 = b;
    var b1 = detect(b0);
    var b2 = detect(b1);

    console.log(b + " = " + b2.length);
	return b2.length;
    }




//Tests

var bG1 = [1,2,-3,4]; //4
var bG2 = [-1,1,-1,1]; //1
var bG3 = [13,-5,3,4,5]; //4
var bG4 = [4,4,4,4]; //1
var bG5 = [5]; //1

huntBats(bG1);
huntBats(bG2);
huntBats(bG3);
huntBats(bG4);
huntBats(bG5);