What is the scope of variables in javascript? Do they have the same scope inside as opposed to outside a function? Or does it even matter? Also, where are the variables stored if they are defined globally?...
I know it's possible in PHP to have "variable" variables. For example $x = "variable"; $$x = "hello, world!"; echo $variable; // displays "hello, world!" Is it possible to refer to a variable by its name as a...
Which method of checking if a variable has been initialized is better/correct? (Assuming the variable could hold anything (string, int, object, function, etc.)) if (elem) { // or !elem or if (typeof(elem) !== 'undefined') { or if (el...I know in PHP we can do something like this: $hello = "foo"; $my_string = "I pity the $hello"; Output: "I pity the foo" I was wondering if this same thing is possible in JavaScript as well. Using variables inside strings...
So for example: function(input){ var testVar = input; string = ... string.replace(/ReGeX + testVar + ReGeX/, "replacement") } But this is of course not working :) Is there any way to do this?...I wanted to check whether the variable is defined or not. For example, the following throws a not-defined error alert( x ); How can I catch this error?...
What are the differences and/or advantages, if any, of using commas when declaring a group of variables rather than semicolons. For example: var foo = 'bar', bar = 'foo'; versus var foo = 'bar'; var bar = 'foo';...
I can access a PHP var with Javascript like this: <?php $fruit = "apple"; $color = "red"; ?> <script type="text/javascript"> alert("fruit: " + "<?php echo $fruit; ?>"); // or s...I have a piece of JS code to generate random numbers and output them as variables to be used here in place of the rotation values @-webkit-keyframes rotate { 0% {-webkit-transform: rotate(-10deg);} 100% {-webkit-transform: rotate(10deg);}...©2020 All rights reserved.