I’ve always wondered what the difference between them were. They all seem to do the same thing… Answer The difference is in the return values. .map() returns a new Array of objects created by taking some action on the original item. .every() returns a boolean – true if every element in this …
Tag: foreach
Iterating over result of getElementsByClassName using Array.forEach
I want to iterate over some DOM elements, I’m doing this: but I get an error: document.getElementsByClassName(“myclass”).forEach is not a function I am using Firefox 3 so I know that both getElementsByClassName and Array.forEach are present. This works fine: Is the result of getElementsByCla…
When iterating over values, why does typeof(value) return “string” when value is a number? JavaScript
I’m using Google Chrome for this test: Contrary to intuition, the first loop alerts “string” three times, while the second loop alerts “number” three times. I was expecting both loops to alert “number” three times. How is the first loop implemented in JavaScript? In o…