how to pass context through callback code example

Example 1: javascript pass this to callback

makeHTTPRequest('GET', 'http://youramazingapi/money_makers.php').then(function(data){
    this.shakeThose.push(data);
}.bind(this));

Example 2: javascript pass iterator to callback

for (var i = 0; i < a.length; i++) (function(i)
{          
	//some function here
  
}) (i);