Is there a clever (i.e. optimized) way to rename a key in a javascript object? A non-optimized way would be: o[ new_key ] = o[ old_key ]; delete o[ old_key ];...
What's the fastest way to count the number of keys/properties of an object? It it possible to do this without iterating over the object? i.e. without doing var count = 0; for (k in myobj) if (myobj.hasOwnProperty(k)) count++; (Firefox did...
I'm just wondering how to get all key values in localStorage. I have tried to retrieve the values with a simple JavaScript loop for (var i=1; i <= localStorage.length; i++) { alert(localStorage.getItem(i)) } But it works only if th...
It seems that when I use a numeric type as a key name in an object, it always gets converted to a string. Is there anyway to actually get it to store as a numeric? The normal typecasting does not seem to work. Example: var userId = 1; console.log...
I have used vue.js for a couple of projects and I have been using the index as the key in the for loops <div v-for="(item, index) in items" :key="index"></div> ...and have started to wonder if there are problems with...
I hate this mess with the mouse buttons created by W3C an MS! I want to know if the left mouse button is pressed when I get a mousedown event. I use this code // Return true if evt carries left mouse button press function detectLeftButton(evt) {...
I'm looking for a KeyListener for a game I'm developing in JavaScript. I have no idea how this would work in real code but it would be something like this: if(keyPress == upKey) { playerSpriteX += 10; } else if(keyPress == downKey) {...
I'm not sure what I am doing wrong here. I want the enter key to work as well as clicking the button. <form action="" method="get" class="priceOptionForm" name="priceOptionForm"> <input name="paypal_e...
Is this allowed? myObj = {}; myObj['4a56546s6d'] Or the key must start with a letter like: myObj = {}; myObj['x4a56546s6d'] Can I mix both like: myObj = {}; myObj['x4a56546s6d'] myObj['4a56546s6d'] I ask that...
I have a Javascript Object that contains a mix of property types including simple strings, objects, arrays of objects... and so on. I would like to sort the keys following this rule: 'Simple properties like strings or numbers appears always be...
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