Identifiers in JavaScript - JavaScript Tutorial 10

Опубликовано: 22 Январь 2017
на канале: ChidresTechTutorials

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Notes for You:: Identifiers in JavaScript - JavaScript Tutorial 10
Identifiers are names given to the program elements by the programmer.
Ex:
name of a variable
name of a constant
name of an array
name of a function
name of an object
etc.

JavaScript Variable Naming conventions:
are the rules for writing identifier names

1. Identifiers should be meaningful.
2. Keywords should never be used as identifiers.
3. The first character can be an alphabet, underscore or dollar character.
4. The first character should not be a number.
5. All succeeding characters can be alphabets, a digits, or underscores.
6. No special characters are allowed except an underscore or dollar.
7. More than one successive underscores or dollars should not be used.
8. Identifiers are case sensitive.

Ex:
Valid: s, p, Num, num, score, _flag, player9, $price, SCREEN_WIDTH, setWidth, Student etc.
Invalid: 9thplayer, _ _flag, $$balance, continue, etc.

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