In PHP you can concatenate a variable name like this
$a = 1
${'fruit_' . $a} = 'apple';
The result will lead to the creation of variable $fruit_a
How would I do this in javascript?
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A for loop that counts the number of list items that are dynamic for each user. Then, javascript will insert all the values of the list items into variables and send it through ajax.thank_you– thank_you2012-08-27 20:42:05 +00:00Commented Aug 27, 2012 at 20:42
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4 Answers
Not sure exactly what you are trying to accomplish, but with JavaScript, you could use the following:
> var a = 1;
> var b = {};
> b['fruit_' + a] = 'apple';
> b.fruit_1
"apple"
> b['fruit_1']
"apple"
Comments
You can do this by assigning the variable to a context. For example, to create a dynamically-named global variable in a browser context, you would use:
const a = 1
window['fruit_' + a] = 'apple'
console.log(fruit_1)
If you're in a Node context, you would use global instead of window. If you were trying to create a variable in a method context, you would use this.
2 Comments
yodalr
To get a global variable, use window instead of this. Eg. window ['fruit_' + a] = 'apple';
Ethan Brown
If you're in the browser context, @yodalr. If you're in node, it would be
global. I'm not sure why, when I originally answered this, I chose to use this, seems odd now. The OP didn't give enough information to determine the scope/context he was trying to create a variable in (shrug).I came across the same scenario, then I use the switch case to manage the list of variables with sequence numbers like this.
var url = 'stackoverflow.com/questions/12149233/concatenate-a-dynamic/variable-name-in-javascript';
var splittedu = url.substring(url.lastIndexOf('/')+1);
var subsections = splittedu.split("/");
for(let i=1; i<subsections.length-1; i++){
switch(i) {
case 1:
subsection1 = subsections[i];
break;
case 2:
subsection2 = subsections[i];
break;
case 3:
subsection3 = subsections[i];
break;
case 4:
subsection4 = subsections[i];
break;
}
Comments
You can try below example, First Initialize -
let myObject = {}
let index = 5
myObject['object__' + index] = 'test';
Output will look like below -
console.log(myObject['object__' + index])
Output - test
console.log(myObject.object__5)
Output - test
