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Logical Operators
Logical operators are used to determine the logic between variables or values.

Given that x = 6 and y = 3, the table below explains the logical operators:

Operator   Description   Example   
&&   and   (x < 10 && y > 1) is true   
||   or   (x === 5 || y === 5) is false   
!   not   !(x === y) is true   

JavaScript String Operators
The + operator, and the += operator can also be used to concatenate (add) strings.

Given that text1 = "Good ", text2 = "Morning", and text3 = "", the table below explains the operators:

Operator   Example   text1   text2   text3   Try it
+   text3 = text1 + text2   "Good "   "Morning"    "Good Morning"   
+=   text1 += text2   "Good Morning"   "Morning

JavaScript Arithmetic Operators
Arithmetic operators are used to perform arithmetic between variables and/or values.

Given that y = 5, the table below explains the arithmetic operators:

Operator   Description   Example   Result in y   Result in x   Try it
+   Addition   x = y + 2   y = 5   x = 7   Try it »
-   Subtraction   x = y - 2   y = 5   x = 3   Try it »
*   Multiplication   x = y * 2   y = 5   x = 10   Try it »
/   Division   x = y / 2   y = 5   x = 2.5   Try it »
%   Modulus (division remainder)   x = y % 2   y = 5   x = 1   Try it »
++   Increment   x = ++y   y = 6   x = 6   Try it »
x = y++   y = 6   x = 5   Try it »
--   Decrement   x = --y   y = 4   x = 4   Try it »
x = y--   y = 4   x = 5

What are the advantages of using bitwise operations?

String literals take the forms:

'string text'
"string text"
"中文 español deutsch English हिन्दी العربية português বাংলা русский 日本語 ਪੰਜਾਬੀ 한국어 தமிழ் עברית"
Strings can also be created using the String global object directly:

String(thing)

It already exists; You can use the CSS3 calc() notation:

div {
    background: olive;
    height: 200px;
    width: 200px;
}

div > div {
    background: azure;
    height: calc(100% - 10px);
    width: 100px;
}