How can i define a variable with a variable in javascript?

javascript variable types
javascript declare variable type
declare variable in html
javascript var scope
javascript var vs let
javascript function
use javascript variable in html
javascript operator

I am not very good at coding but i really need help here is an example of what i am talking about

(edit)

ok so i am making a game in p5.play and in order to define a sprite you need to us

the function var l = createSprite(200,200);

i want to automate this using a variable

var count = 5; var l + count = 1; count++; var l + count = 2;

var l=30 var l + "foo" = 40

lfoo is undefined , it always returns an error is this impossible? if so how can i automate defining variables?

JavaScript Variables, ' ; // define the variable and assign the value alert ( message ) ; // Hello! We can also declare multiple variables in one line:. Variable means anything that can vary. JavaScript includes variables which hold the data value and it can be changed anytime. JavaScript uses reserved keyword var to declare a variable. A variable must have a unique name. You can assign a value to a variable using equal to (=) operator when you declare it or before using it.

You can't define variables like this. You have to define it through writing the absolute name for them. But to call them you can use window["l"+"foo"].

var l = 40;
var lfoo = 30;
console.log(window["l"]+"...."+window["l"+"foo"]);

Variables, var hoisting. Because variable declarations (and declarations in general) are processed before any code is executed, declaring a variable  When learning JavaScript one of the basics is to understand how to use variables. Variables are containers for values of all possible types, e.g. number, string or array (see data types). Every

You could use window to declare global variables

var str = 'l' + 'foo';
window[str] = 40;
//Then you can access lfoo directly

var, Declare JavaScript variables using var keyword​​ To declare a variable, you use the var keyword followed by the variable name as follows: var message; A variable name can be any valid identifier. The message variable is declared and hold a special value undefined . Declaring a variable in Javascript is similar to declaring a variable in most programming languages. The purpose of a variable is to store information (values, expressions) which can be used later. The process of creating a variable is

The Ultimate Guide to JavaScript Variables: var, let, and const , Global variables that do not become a property of window are variables defined with let and const , and class es. There is almost always a better  Variable are like containers in JavaScript. Using variables to store data is the foundation of the language, and it is done in three distinct parts. Variable Declaration: Here the variable is registered in its corresponding scope, the scope of a variable is simply "where the variable can be used." We'll be talking more about scope in the next lesson.

"Variable" variables in Javascript?, Variables in JavaScript are containers which hold reusable data. They are like cups filled with stuff, and this stuff can be used over and over again depending on​  All JavaScript variables must be identified with unique names. These unique names are called identifiers. Identifiers can be short names (like x and y) or more descriptive names (age, sum, totalVolume). The general rules for constructing names for variables (unique identifiers) are: Names can contain letters, digits, underscores, and dollar signs.

Declaring JavaScript Variables: var, let and const ― Scotch.io, Below are some examples of declaring and initializing variables in JavaScript: // declaring single variable var name; // declaring multiple variables var name, title,​  The PHP variable needs to be defined before the JS one. 2. The JS variable needs to be defined before you actually use it anywhere. This seems obvious, but if you forget this fact and try to put this declaration into the footer of your site and then use it in the content,

Comments
  • what do you want in result ?
  • Why do you want that? You can create the new variable directly with var lfoo = 40.
  • you can't define variables like this. you have to define it through writing the absolute name for them. But to call them you can use window["l"+"foo"]
  • Possible duplicate of Use dynamic variable names in JavaScript
  • Why do you need that? To me it smells like bad code..