What does ' ', and " ", and no quotes mean in Javascript?

Question

I realized I've been switching between them with no understanding as to why, and am finding it hard to search for.

Answer 1

' ' and " " are the same thing; they are used to define string literals.

Things without quotes can be an identifier, keyword, non-string literal, property name or a number (may have missed one).

Examples:

"hello world"        literal (string)
'hello world'        literal (string) with same contents
document             identifier (object)
{ a: 1 }             property name
if                   keyword (start conditional statement)
3.4                  literal (number)
/abc/                literal (regex object)

String literals that are enclosed in single quotes don't need escaped double quotes and visa versa, e.g.:

'<a href="">click me</a>'    HTML containing double quotes
"It's going to rain"         String containing single quote

Answer 2

' ' and " " used to quote string literal and represents string(s) whereas literal without quote are variables (name of variable, constant) know as identifier, example

variable = 'Hello'; (Here `variable` is identifier and 'Hello' is string literal)


var = "Ho There"

You might question, what is the difference between ' (single quote) and " (Double quote)

Difference is ,strings within " if have special character then they need to escape. Example:

Variable = "hi " there"; ---> here you need to escape the " inside string like

Variable = "hi \" there"; 

But if using, ' then no need of escaping (unless there is a extra ' in string). You can hve like

var = 'Hello " World"';