There are about 35 variables on a page which starts as blank. Each variable is used for a different purpose.
var a = '', b = '', c = ''; Is there a shorter way of writing these variables?
- 1Just remember that being idiomatic should be more important than be fast ;)sospedra– sospedra2015-06-29 07:09:20 +00:00Commented Jun 29, 2015 at 7:09
- 1@Deerloper Is entirely right. I find your method to be much easier to read than Milind's answerCodingIntrigue– CodingIntrigue2015-06-29 07:15:48 +00:00Commented Jun 29, 2015 at 7:15
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2 Answers
11 Comments
Becky
Can this technique be use to all similar vars? e.g.:
var a = b = c = 10, OR var a = b = c = 'Yes',
Milind Anantwar
@Becky: yes..absolutely. check the demo. it is alerting the sum of three variable to 30 when
var a = b = c = 10 is used.
TaoPR
Beware when defining object
var a = b = c = [1,2,3,4]. All variables are sharing the same reference.
CodingIntrigue
@Becky No, it means they all refer to the same object. So modifying
c will update a and b.TaoPR
Nope. It means defining all variables with [1,2,3,4]. However, they share the same reference so any changes you made on any of them will affect all the rest.
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Whenever you see yourself repeating something, you want to look for a better way of doing it:
In this case, there's something called an Array of variables. Usually, you use arrays with loops to achieve repetitive tasks.
An array is a list of variables that can be accessed by index. It's as if you had a variable named a0, a1, a2, a2, etc... Wouldn't be awesome to be able to go through all the variables without having to type each one explicitly?
This is how arrays and loops work together:
var a = new Array(); // declare the array; "a" is the name of your array here a[0] = ""; // this is how you assign the first index in the array a[1] = ""; // second, etc // now stop doing this manually and do the code below // this is how you loop 30 times assigning each variable in the array to an empty string for (var i=0; i < 30; i++) { a[i] = ""; } console.log("This is the array: ", a); PS: there are better ways of addressing your question but this one is the most straightforward =)
