Learning RxJs

ex12

return movieLists.map( 
    
    // map receives 3 args 
    // cat - element to iterate
    // cIndex - index in the array of the element
    // cCollection - movieLists array
    // same applies for the rest if the code
    (cat, cIndex, cCollection) => { 
      //v for videos object
      return cat.videos.map ( (v,vIndex,vCollection) => { 
        //if you open the debugger (F12) you will see the variables values
      	debugger;
      	//pressing F11 in the next line and with some good luck you can see the code of ex 7
      	return v.boxarts.filter( (box,bIndex,bCollection) => {
      		debugger;
      		//using coercion with double equals cool!
      		return box.width=='150'
      	})
      	.map( (filteredResult,fRIndex,fRCollection) => {
      		debugger;
      		return {
      			'id': v.id ,
      			'title' : v.title , 
                'boxart': filteredResult.url
      		}
      	})
   }).concatAll()
}).concatAll()    

http://jhusain.github.io/learnrx/