append(_:)在末尾添加一个元素
append(contentsOf:)在末尾添加多个元素
//: A UIKit based Playground for presenting user interface
import UIKit
var array = [(42,"erro2"),(41,"erro1"),(43,"erro3")]
array.append((40,"error0"))
array.append(contentsOf: [(42,"erro2"),(41,"erro1")])
print(array)
[(42, "erro2"), (41, "erro1"), (43, "erro3"), (40, "error0"), (42, "erro2"), (41, "erro1")]
同理也有
insert(_:at:) 在指定位置插入一个元素
insert(contentsOF:at)在指定位置插入多个元素
//: A UIKit based Playground for presenting user interface
import UIKit
var array = [(42,"erro2"),(41,"erro1"),(43,"erro3")]
array.insert((40,"error0"),at: 0)
array.insert(contentsOf: [(42,"erro2"),(41,"erro1")],at: array.endIndex)
print(array)
[(40, "error0"), (42, "erro2"), (41, "erro1"), (43, "erro3"), (42, "erro2"), (41, "erro1")]
字符串也是Collection
字符串也是Collection Element时Character类型
["d", "e", "f", "g", "h", "a", "b", "c"]
移除单个元素
remove(at:)移除并返回指定位置的一个元素
removeFirst()移除并返回数组的第一个元素
popFirst() 移除并返回数组的第一个元素（optional）,数组为空返回nil.
//: A UIKit based Playground for presenting user interface
import UIKit
var chars:[Character] = ["a","b","c","d"]
print(chars)
let removedChar = chars.remove(at: 1)
print(removedChar)
print(chars)
let removedChar2 = chars.removeFirst()
print(removedChar2)
print(chars)
结果
["a", "b", "c", "d"]
b
["a", "c", "d"]
a
["c", "d"]
移除多个参数
removeFirst(:) 移除前面多个元素
removeList(:)移除后面多个元素
//: A UIKit based Playground for presenting user interface
import UIKit
var chars:[Character] = ["a","b","c","d"]
chars.removeFirst(2)
print(chars)
chars.removeLast(2)
print(chars)
["c", "d"]
[]
removeSubrange(_:)移除数组中给定范围的元素
removeAll() 移除数组所有元素
removeAll(keepingCapacity:)移除所有元素，保留数组容量
//: A UIKit based Playground for presenting user interface
import UIKit
var chars:[Character] = ["a","b","c","d"]
chars.removeSubrange(1...2)
print(chars)
chars.insert(contentsOf: "bc", at: 1)
print(chars)
chars.removeAll()
print(chars)
print(chars.capacity)
chars.insert(contentsOf: "abcd", at: 0)
print(chars)
chars.removeAll(keepingCapacity: true)
print(chars)
print(chars.capacity)
["a", "d"]
["a", "b", "c", "d"]
[]
0
["a", "b", "c", "d"]
[]
4
