In JavaScript, tokens are the basic building blocks of the code that the interpreter understands and processes. These tokens are categorized into different types based on their function and meaning. Here's a list of the main JavaScript tokens:
Reserved Keywords:
These words have special meanings within the language and cannot be used as variable names or identifiers. Examples include var, let, const, if, else, for, while, function, return, etc.
Identifiers:
These are names given to variables, functions, classes, and other entities you define in your code. They must start with a letter or underscore (_), followed by letters, numbers, or underscores.
Literals:
These represent fixed values directly embedded in your code. Examples include:
Numbers: 123, 4.56, -100e2
Strings: "Hello, world!", 'This is a string', ${variableName} (template literals)
Booleans: true, false
Null: null
Undefined: undefined
Operators:
These perform various operations on values. Examples include:
Arithmetic: +, -, *, /, %
Comparison: ==, !=, ===, !==, <, >
Logical: &&, ||, !
Bitwise: &, |, ^, <<, >>
Assignment: =, +=, -=, *=, etc.
Punctuators:
These are special characters used for syntax and structure. Examples include:
Brackets: [], {}, ()
Commas: ,
Semicolons: ;
Quotes: ', "
Dots: ., .. (spread operator)
Arrows: -> (function definition)
Whitespace:
Spaces, tabs, and newlines are generally ignored by the interpreter but can be used for readability.
Comments:
Comments are lines of text ignored by the interpreter but used to explain your code and improve its clarity. They start with // for single-line comments or /* ... */ for multi-line comments.
Remember that this is a basic overview, and the specific list of tokens might vary depending on the JavaScript version and specific context.
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