[Javascript] Advanced Reduce:flatten, Flatmap and Reduceright

Learn a few advanced reduction Patterns:flatten allows your to merge a set of arrays into a single array, the dreaded flat Map allows you to convert a array of objects into a array of arrays which then get flattened, and reduceright allows you To invert the order in which your reducer are applied to your input values.

Flatten

var data = [[4,5,6], [[7,8,9]]; var flatdata = Data.reduce (ACC, value) = {  return//[1, 2, 3, 4, 5, 6, 7, 8, 9]

Flatmap

varinput =[{title:"Batman begins", Year:2005, cast: ["Christian Bale",      "Michael Caine",      "Liam Neeson.",      "Katie Holmes",      "Gary Oldman.",      "Cillian Murphy"]}, {title:"The Dark Knight", Year:2008, cast: ["Christian Bale",      "Heath Ledger",      "Aaron Eckhart",      "Michael Caine",      "Maggie Gyllenhal",      "Gary Oldman.",      "Morgan Freeman"]}, {title:"The Dark Knight Rises", Year:2012, cast: ["Christian Bale",      "Gary Oldman.",      "Tom Hardy",      "Joseph Gordon-levitt",      "Anne Hathaway",      "Marion Cotillard",      "Morgan Freeman",      "Michael Caine"    ]  }];varFlatmapinput = Input.reduce (ACC, value) = ={Value.cast.forEach (star)={    if(Acc.indexof (Star) = = = 1) {Acc.push (star);  };    }); returnacc;}, []);//["Christian Bale", "Michael Caine", "Liam Neeson", "Katie Holmes", "Gary Oldman", "Cillian Murphy", "Heath Ledger", "A Aron Eckhart "," Maggie Gyllenhal "," Morgan Freeman "," Tom Hardy "," Joseph Gordon-levitt "," Anne Hathaway "," Marion Cotilla Rd "]

Reduceright

var countdown = [1,2,3,4, "5"]; var str = countdown.reduceright (ACC, value) ={  return ACC +""  // "54321"

[Javascript] Advanced Reduce:flatten, Flatmap and Reduceright