angularjs - Can function and closures replace classes in Javascript? -

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• how javascript closures work? 89 answers

i reading angularjs , came across following statement on newsgroup:

i have say, though, more use angular, less interest have in creating classes. classes not javascript at! can pretty need pure functions , closures , don't have worry troublesome "this" , "that".

can explain meant "closures".

closures structure in javascript code within nested functions outer functions scope retained within inner function.

for example:

function outer(x,y){     var t = 1;     return function(z){         //x, y, t outer function made available inner function         return x + y + z + t;      } }  var outer1 = outer(1,1);  //creating closure, or instance of function in sense alert(outer1(1)); //alerts 4  var outer2 = outer(2,2); alert(outer2(2)); //alerts 7 

the simple explanation of closure ecmascript allows inner functions; function definitions , function expressions inside function bodes of other functions. , inner functions allowed access of local variables, parameters , declared inner functions within outer function(s). closure formed when 1 of inner functions made accessible outside of function in contained, may executed after outer function has returned. @ point still has access local variables, parameters , inner function declarations of outer function. local variables, parameter , function declarations (initially) have values had when outer function returned , may interacted inner function.

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