What is the difference between ' and " in JavaScript?
JavascriptStringJavascript Problem Overview
I saw this question and I am wondering about the same thing in JavaScript.
If you use the character ' or the character " when making strings in JavaScript, the application seems to behave the same. So what is the difference between these two characters?
The only advantage I have seen in using ' to build strings is that I can do stuff like:
var toAppend = '<div id="myDiv1"></div>';
Instead of:
var toAppend = "<div id=\"myDiv1\"></div>";
Is there any significant difference between them that I should be aware of?
Javascript Solutions
Solution 1 - Javascript
They are equivalent for all intents and purposes. If you want to use either one inside a string, it is a good idea to use the other one to create the string, as you noted. Other than that, it's all the same.
Solution 2 - Javascript
Although not technically a difference in Javascript, its worth noting that single quoted strings are not valid JSON, per se. I think that people automatically assume that since JSON is valid JS, that valid JS strings are also valid JSON, which isn't necessarily true.
E.g., {'key': 'Some "value"'} is not valid JSON, whereas {"key": "Some 'value'"} is.
Solution 3 - Javascript
There's no difference. The reason for its existence is exactly what you mentioned
Solution 4 - Javascript
Good practice, according to Mozilla, is to use " " in HTML (where ' ' cannot be used) while reserving ' ' in Javascript (where both " " and ' ' can be use indifferently)...
Solution 5 - Javascript
I think there is another difference. If you do the following
var str1 = 'The \' character';
var str2 = 'The " character';
var str3 = "The ' character";
var str4 = "The \" character";
document.write(str1.replace("'", "%26"));
document.write(str2.replace('"', "%22"));
document.write(str3.replace("'", "%26"));
document.write(str4.replace('"', "%22"));
The document.write will fail for str1 and str4. That is the difference, but I don't know if there is a workaround to make them work.
Solution 6 - Javascript
Try this:
console.log("mama+"mama"")
Output : Uncaught SyntaxError: missing )
after argument list
Now try:
console.log('mama+"mama"')
Output : mama+"mama"
They are equivalent! but sometimes you want to use "" inside a string, and that why we have '
Solution 7 - Javascript
As written above, there is no difference but for situation you need to use "/' inside a string.
I think a better practice for situation you need to concatenate strings with variables is using a template strings:
Price: ${price}, Amount: ${amount}. Total: ${price*amount}
That's way you can add " and ', and concatenate variables.
Much easier to read, much easier to write.
Solution 8 - Javascript
WARNING!!!!
There is a difference. When adding to arrays, you have to use one or the other. The array gets confused when you use two different types of quotes.
Example:
//WILL NOT WORK
var array = ["apple","orange","banana"];
array.push('pear');
//WILL WORK
var array = ["apple","orange","banana"];
array.push("pear");