Split String and Sum Values

JavaScript
1

I have this function: when a user fill a field with this “c 10 20 30” i need to sum just the numbers and show the result.

I have this but is NOT working…


 function escaja(str, prefix) {
    							if (str.indexOf(prefix)===0){
							var sumar = str.split(" ");
							var sumar1 = 0;
							for(i = 0; i < sumar.length; i++){
								
								if (!isFinite(sumar1)) {
								sumar1 = Number(sumar[i]+sumar1);
								}
}

Any idea…???

2

I found a solution:

					  function escaja(str, prefix) {
    					//return str.indexOf(prefix) === 0;
						if (str.indexOf(prefix)===0){
							var sumar = str.split(" ");
							var sumar1 = 0;
							
							for(i = 1; i < sumar.length; i++){
								sumar1 = parseFloat(sumar[i]) + parseFloat(sumar1);
							}
						document.items.quantity.value = sumar1;
						
						}
						}

If someone have a better idea plz let me know.