Question

I have an array of strings,

["item1", "item2"] 

I’d like to change my array to

["showItem1", "showItem2"]

Answer 1

The most easy to understand way of doing exactly what you ask for is probably something like this:

var items = ["item1", "item2"];

​for (var i=0;i<items.length;i+=1) {
   items[i] = "show" + items[i].charAt(0).toUpperCase() + items[i].substring(1);
}

console.log(items); // prints ["showItem1", "showItem2"] 

Explanation: build a new string consisting of the string “show” + the first character converted to uppercase + the remainder of the string (everything after the first character, which has index 0)