How javascript call methods working?

Question

Hi I was looking at the core codes of hapijs framework and i noticed this.

 Plugin.call(this, this, [], '', null);

I have no idea why they are passing two this and [], '', null and what it is supposed to do.

Answer 1

Check out this file: https://github.com/hapijs/hapi/blob/master/lib/plugin.js#L21

As mentioned, the first this is passing context: fun.call(thisArg[, arg1[, arg2[, ...]]])

Given the function's arguments list (server, connections, env, parent), the final arguments call would be:

server: this
connections: []
env: ''
parent: null

Also, read up on .call() here: http://mzl.la/18EkRLg