JavaScript is ...
a dynamic, weakly typed, prototype-based language with first-class functions.
JS is Dynamic
//Compilation and execution happen together.
var propMap = {
val: "value", html: "innerHTML"
};
for(var fnName in propMap){
$.prototype[fnName] = (function(prop){
return function(){
return this[prop];
}
})(propMap[fnName]);
}JS is Weakly Typed
//Type associated with value, not variable.
var a = 1;
a = "one";
a = [1];
a = {one: 1};JS has 1st Class Functions
//Treat like any object
var square = function(x){ return x*x }, //create
mult = function(f1, f2){ // Return
return function(n){
return f1(n)*f2(n);
}
},
bigF = mult(square, square), // ARG
value = bigF(2); // 16JS is Prototype Based
JavaScript (JS) is a lightweight, interpreted or JIT compiled programming language with first-class functions. Most well-known as the scripting language for Web pages, many non-browser environments also use it, such as node.js and Apache CouchDB. JS is a prototype-based, multi-paradigm, dynamic scripting language, supporting object-oriented, imperative, and declarative (e.g. functional programming) styles.