My array contains the following values:
var items = [Thursday,100,100,100,100,100,100]
I am retrieving these values from the URL query string which is why they are all in string format. I am looking for a way to make all columns except the first one as numbers. Since the number of columns in the array may change, I need a solution where items[0] remains a string but items[n] always turns into a number. Is there any way to achieve this?
"Is there a method to ensure that items[0] is always a string, while items[n] is always a number?"
To achieve this, utilize the following steps: Use .shift() to extract the first element, .map() to convert all elements to numbers, then use .unshift() to re-insert the first element as a string.
var first = items.shift();
items = items.map(Number);
items.unshift(first);
See Demo: http://jsfiddle.net/EcuJu/
You can simplify the above code snippet like so:
var first = items.shift();
(items = items.map(Number)).unshift(first);
See Demo: http://jsfiddle.net/EcuJu/1/
In my opinion, this solution should meet your needs. You have the flexibility to choose any default value you prefer instead of 0.
var data = ["Monday", "50", "60", "70", "80", "90", "100"], index;
for (index = 1; index < data.length; index++)
{
if(typeof data[index] !== "number")
{
data[index] = isNaN(parseInt(data[index], 10)) ? 0 : parseInt(data[index], 10);
}
}
Using the parseFloat() function will transform your string into a numerical value.
Check out this code snippet that works in most modern browsers (but not in IE7/IE8):
var updatedItems=items.map(function(value,index){
// Converting array elements where index is greater than 0
return (index>0)?parseFloat(value):value;
});
If you need to convert to integers, there's also the parseInt() method:
parseInt(value,10)
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