JavaScript Exam

Primitive: Boolean, Number, String, Null, UndefinedComposite: Function, Object, Array (aside Array inherits from Object)

Date
RegExp
Error

Its a value that stands for Not a Number.

Boolean(x) or !!x

Undefined
null
empty string
0
NaN

Array[index] returns the value of the array stored at the index.delete array[index] the value at array[index] becomes undefined and the array.length remains the same.

Pop() //removes and returns element from end of the arraypush(value)//pushes element onto end of array. Returns new lengthshift() //Removes and returns element from the front of the array and shifts all elements down.unshift(value)//Inserts value to front of array. Returns new length.

Array.sort() sorts array based on string order.array.sort(sortOrderFunction) sorts array based on sortOrderFunction.

Array0.concat(array1,...,arrayN) returns new array with values array0 - arrayN concatentated together. array0.slice(idx1) // returns new array w/ values staring from idx1array0.slice(idx1,idx2) // returns new array w/ values staring from idx1 to idx2-1.array0.splice(idx1, count) // deletes count elements from idx1 in array0array0.splice(idx1,count,val1,..,valN) // deletes count elements from idx1 and adds val1 - valN to array0

Var funVar = function Epic$Namespace$FunctionName(param1,...,paramN){ body;}

It's important for debugging JavaScript errors, since the functionName will appear in the call stack.

It is defined within a function body. argument[n] // returns the nth argument passed in.argument.length // returns the number of arguments passed in.

FuncName.length // returns number of named parameters when funcName defined.funcName.prototype // Used when funcName is used as a constructor. Serves as template for an entire class.

Func1.apply(obj, argsArray); // invokes func1 as if it were a method inside obj. w/i func1 this refers to obj. func1.call(obj,arg1,...,argN); // same as apply but argsArray listed out.func1.toString(); // returns String representation of function. By default returns the code that is executed when func1 is invoked.

Create a function and attach a prototype to it. namespace.myClass = function namespace$myClass(param1){ this.__privateVal1 = param1; this.__privateVal2 = "abc"}namespace.myClass.prototype = { __privateVal1: 0, __privateVal2: "abc", classfunction1: function namespace$classfunction1() { //function body }}