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空の配列を定義する方法
// 書き方パターン ①
var array: [String]
array = []
// 書き方パターン ②
var array = [String]()上記はString型なので、配列の要素がInt型になる場合は、Intに置き換えてください。
単に var array = [] だけではエラーになるので要注意。
