Trace Trace - 1 year ago 91
jQuery Question

What are the benefits of commas compared to semicolons in jQuery?

Possible Duplicate:

Declaring Multiple Variables in JavaScript

I was setting some variables in jQuery and someone suggested I do it this way:

var $wrapper = that.parents(".wrapper"),
$prettyCheckBox0 = $wrapper.find(".prettyCheckbox small:eq(0)"),
$prettyCheckBox1 = $wrapper.find(".prettyCheckbox small:eq(1)"),
$prettyCheckBox2 = $wrapper.find(".prettyCheckbox small:eq(2)"),
standard = $prettyCheckBox0.parents("span").parents("label").prev("input").val(),
professional = $prettyCheckBox1.parents("span").parents("label").prev("input").val(),
premium = $prettyCheckBox2.parents("span").parents("label").prev("input").val();

Though this works, I was wondering if anyone has a reason on why to pick commas over semicolons. How does it work? It seems like it would cause syntax errors. Also, why is there one one

Answer Source

The end of your question contains the answer to the beginning: var can be used for defining multiple variables in the same statement, like this:

var a = 1, b = "foo", bar = xyzzy(), baz = $('#something');

This is what happens in your snippet, and it's equivalent to

var a = 1;
var b = "foo";
var bar = xyzzy();
var baz = $('#something');

There isn't an objective benefit from picking one over the other, it is a matter of coding style/convention.

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