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首先呢, 有兩個陣列…

ary1 = ["ruby", "coffeescript", "haskell", "lisp"]
ary2 = ["ruby", "python", "javascript", "lisp"]

大家都有, 沒什麼好說的

ary1.concat(ary2)
 => ["ruby", "coffeescript", "haskell", "lisp",
      "ruby", "python", "javascript", "lisp"]

ary1 + ary2
 => ["ruby", "coffeescript", "haskell", "lisp",
     "ruby", "python", "javascript", "lisp"]

差異在於 .concat 會影響 ary1, + 不會.


連續技:

ary1 << "clojure" << "perl" << "scala"
  => ["ruby", "coffeescript", "haskell", "lisp",
       "clojure", "perl", "scala"]

原理是因為<<會回傳加入新元素後的陣列.


有趣的來了

  • 聯集(Union)
ary1 | ary2
 => ["ruby", "coffeescript", "haskell", "lisp",
     "python", "javascript"]
  • 交集(Intersection)
ary1 & ary2
 => ["ruby", "lisp"]
  • 差集(Difference)
ary1 - ary2
 => ["coffeescript", "haskell"]

ary2 - ary1
 => ["python", "javascript"]
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Tai-An Su

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