# Operators

Just list common use symbols in here.

## Plus Sign `+`, `++`

* The difference between `i++`, `++i`
* Python do not have `++`.
* In python, you can have `+` operator by implementing the class `__add__` method.

## Vertical Bar `|`, `||`

## Block :

* `()`
* `{}`

## Question Mark `?`

* In java and javascript Ternary

## Equal `=`, `==`, `===`

## [Regular expression](https://regexr.com/)

* Metacharacter and Quantification
  * `^`
  * `$`
  * `.`
  * `+`
  * `*`
  * `\`
  * `?`
* Understanding `match()` and match groups
* Look ahead
  * Good use in number of character password validation.
  * Also negative look ahead, look behind, negative look behind.
* Match into dictionary.
* You don't really use regular expression constantly.
  * Recommendation to have another text search base test.

## The bitwise and shift operator

* It's brain melting operators.
* Use in  more low level languages to enhance performance.
* For the high level languages, it's rarely to have them.