High Level Programming

Summary of JS high level programming / meta programming features

Code generation

eval

Functional Programming

Pass function as parameters:

• someArray.forEach( (currentValue, index, theArray) => {...})
• someArray.map( (currentValue, index, theArray) {... return elementForNewArray})
• someArray.filter((currentValue, index, theArray) {... return trueOrFalse_IncludeInNewArray})
• someArray.reduce(callback [, initialValue]) - reduce array to one value, for example the sum

Function methods (call, bind, apply...)

Closure

Every time a function is entered, a closure is created. If something inside that closure is referred (example by a return function) that closure is preserved.

function returnClosure(p1) { return function(p2){ return p1+p2;}}

Symbol

New primitive in ES6. 'reflection within implementation' - sprinkle on existing classes & objects to change the behavior. See separate note.

Reflection

Reflection is about discovery of low-level information of code (function name, arguments, etc.)

Use Function and Object prototype methods to explore function / object. (see separate notes)

typeof & instanceof

Proxy

Proxy is about 'interception'