Protect functions and var names on a javascript code -

im designing api requires users download javascript file server , load on pages. inside file there function call generic(), if users include js , reason have piece of js on page there function call generic() represent issue. im not front end dev, know php can solve creating class , putting functions inside, can call them $myclass->myfunction();, how can solve on js? approach on js? (no jquery please.)

you have expose @ least 1 identifier globally, common approach wrap in immediately-invoked function expression:

var yournamespace = (function () {      var privatedata = 10; // not accessible outside iife      // expose public properties (these functions can access private data)     return {         somemethod: function () {             // stuff         },         anothermethod: function () {             // more stuff         }     };  }()); 

this expose single identifier, yournamespace, object properties can used methods. can use this:

yournamespace.somemethod();