8. 原則 可能な限り let を使う let prices = [100.0, 300.0, 200.0] let withTax = { $0 * 1.08 } let pricesWithTax = prices.map(withTax) let sum = pricesWithTax.reduce(0) {$0+$1} Swift ➡ Swift らしい安全なコードになる
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