格納するオブジェクト型を指定しないとimmutableなarrayになるらしい。
let array0 = [] // immutable
var array1 = [] // immutable
var array2 = ["1", "2"] //mutable
var array3: String[] = [] // mutable
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格納するオブジェクト型を指定しないとimmutableなarrayになるらしい。
let array0 = [] // immutable
var array1 = [] // immutable
var array2 = ["1", "2"] //mutable
var array3: String[] = [] // mutable
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