基本数据类型 String 字符串下标 字符串的下标 Subscripting可以提取字符串特定位置的字符。 # 提取第一个字符 print('Hello'[0]) # H # 提取最后一个字符 print('Hello'[len('Hello') - 1]) # ...

MENU = { 'espresso': { 'ingredients': { 'water': 50, 'coffee': 18, }, 'cost': 1.5, }, 'latte': { 'ingredients': { 'water': 200, 'milk': 150, 'coffee': 24, }, 'cost': 2.5, }, 'cappu...

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Swift lets us perform async operations using both await and async let, but although they both run some async code they don’t quite run the same: await wai...

Swift lets us attach metadata to a task using task-local values, which are small pieces of information that any code inside a task can read.Swift 允许我们使用 task-local ...

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