Swift内建函数

文章目录

1. abs(singedNumber):返回给定的有符号数字的绝对值

abs(-1) == 1
abs(-42) == 42

2. contains(sequence,element):判断给定的序列（如数组）是否包含特定的元素

var languages = ["Swift","Objective-C"]
contains(languages,"Swift") == true
contains(languages,"Java") == false
contains([29,85,42,96,75],42) == true

3. drop

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1. abs(singedNumber):返回给定的有符号数字的绝对值

abs(-1) == 1
abs(-42) == 42

2. contains(sequence,element):判断给定的序列（如数组）是否包含特定的元素

var languages = ["Swift","Objective-C"]
contains(languages,"Swift") == true
contains(languages,"Java") == false
contains([29,85,42,96,75],42) == true

3. drop