I have an array with these values:
var items = [Thursday,100,100,100,100,100,100]
I'm grabbing these from the URL query string so they are all string values. I want all columns except the first to be number. The array may vary in the number of columns, so is there a way to set this so items[0] is always a string, but items[n] is always a number?
"...is there a way to set this so items[0] is always a string, but items[n] is always a number?"
Use .shift() to get the first, .map() to build a new Array of Numbers, then .unshift() to add the first back in.
var first = items.shift();
items = items.map(Number);
items.unshift(first);
DEMO: http://jsfiddle.net/EcuJu/
We can squeeze it down a bit like this:
var first = items.shift();
(items = items.map(Number)).unshift(first);
DEMO: http://jsfiddle.net/EcuJu/1/
I think this should work for you. You could set whatever default number you liked instead of 0.
var items = ["Thursday","100","100","100","100","100","100"], i;
for (i = 1; i < items.length; i++)
{
if(typeof items[i] !== "number")
{
items[i] = isNaN(parseInt(items[i], 10)) ? 0 : parseInt(items[i], 10);
}
}
typeof check.parseFloat() will convert your string to a number.
Here is a sample code for modern browsers (won't work in IE7/IE8):
var convertedItems=items.map(function(element,index){
// Convert array elements with index > 0
return (index>0)?parseFloat(element):element;
});
There's also a parseInt() method for conversion to integers:
parseInt(element,10)
