What is CoffeeScript?
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CoffeeScript is a translation language for JavaScript, and its founder JeremyAshkenas jokingly calls it the less extravagant little brother of JavaScript. Because CoffeeScript compiles code similar to Ruby syntax into JavaScript, and most of the structures are similar, the difference is that CoffeeScript has a stricter syntax.
How's CoffeeScript?
CoffeeScript, like TypeScript, is a language compiled into JavaScript, and they enhance the expressive power of JavaScript. The so-called compile to JavaScript means that CoffeeScript and TypeScript do not implement their own runtime, they are compiled into equivalent JavaScript code, and then run on JavaScript's interpreter.
The biggest impression of CoffeeScript is its concise expression.
# assignment:
Number=42
Opposite=true
# conditions:
Number=-42ifopposite
# function:
Square= (x)-> xxxx
# Array:
List= [1,2,3,4,5]
# object:
Math=
Root:Math.sqrt
Square:square
Cube: (X)-> x*squarex
# Splats:
Race= (winner,runners...)->
Printwinner,runners
The conciseness of CoffeeScript
CoffeeScript strives for simplicity. Its conciseness is first shown in the removal of some symbols that are only used for grammar control. These include:
Cancel semicolon
Cancel the var statement
Unenclose the inner code in curly braces and use indentation instead
Function calls can omit parentheses without ambiguity
The var declaration involves the complex and complex scope mechanism of JavaScript variables. Let's put this part aside for a while. CoffeeScript simplifies the problem by eliminating the var declaration mechanism altogether. In short, in the CoffeeScript world, variables do not need to be declared in advance, just use them. And there is little danger in this usage.
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