Why are objects not iterable by default?  I see questions all the time related to iterating objects, the common solution being to iterate over an object's properties and accessing the values within an object that way. This seems so common that...
I've been implementing a useful subclass of the ES6 Set object.  For many of my new methods, I want to accept an argument that can be either another Set or an Array, or really anything that I can iterate.  I've been calling that an "itera...
The search function in the following code is not working and I believe it has something to do with the For...In loop but I am new to JS and unsure why:  var friends = { bill: {     firstName: "bill",     lastName: "smith",     number:...
I've been playing around with JS and can't figure out how JS decides which elements to add to the created array when using Array.from(). For example, the following emoji ???? has a length of 2, as it is made of two code points, but, Array.fro...
I need to iterate over an array for which the keys are non-consecutive:  var messages = new Array(); messages[0] = "This is the first message"; messages[3] = "This is another message";   Obviously using the index of a for loop will no...
Target  I'd like to loop through DOM text nodes, sorted by their order inside the DOM. Furthermore I'd like to filter nodes by custom logic (e.g. check if a node is inside a specific element). Additionally all this should be done in the best...
So I can get all of the images I want into an array and pass them to $image.  However when I try to loop over that array it just keeps alerting the same item 3 times.  The code I'm having trouble with.     getItem : function($image){     console....
A javascript WeakMap ( https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakMap ) does not allow you to get the key, or the length or size, by design.  Is it possible to nevertheless loop over entries in some way ?  If...
Do you know a JavaScript library that implements a generic Iterator class for collections (be it Arrays or some abstract Enumerable) with a full set of features, like the Google Common  or the Apache Commons?  Edit: Enumerable#each is not an Iterator...

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