JS

Question 1

bind

Answer 1

when referencing a function that uses this., set this to the first arg, then the remaining params to the param array

function.bind(thisArg[, arg1[, arg2[, …]]])

Returns a new function that, when called, will have this equal to thisArg, the first parameter equal to param1, the second parameter equal to param2, etc.

var Button = function(content) { 
  this.content = content;
};
Button.prototype.click = function() {
  console.log(this.content + ' clicked');
}

var myButton = new Button('OK');
myButton.click();

var looseClick = myButton.click;
looseClick();

var boundClick = myButton.click.bind(myButton);
boundClick();

// Example showing binding some parameters
var sum = function(a, b) {
  return a + b;
};