ruby基础学习－－数组

1.ruby数组定义

arr1=Array.new  #定义空数组

arr1=Array.new(5)  ＃有五个空元素的数组

arr1=Array.[]

arr1=Array[0,1,3,5]

arr1=Array.[](0,1,3,5)

arr1=Array(0..9)

2.元素操作

get查

arr1[2]              arr1[2,5]

arr1.at(2)

arr1.fetch(i)      arr1.fetch(i,default)

arr1.slice(i)      arr1.slice(1,5)

arr1.shift()

arr1.pop()

arr1.first          arr1.last

arr1.size         arr1.length     arr1.empty? 

arr1.include?(obj)   arr1.index(obj)

put增改

arr1[i]=obj

arr1.fill()

arr1.push(obj)

arr1.unshift(obj)

arr1.insert(i,obj)

arr1<<obj

arr1.collect{|i| block}    arr1.collect!{|i| block}

delete 删

arr1.delete(obj)       arr1.delete_at(i)    arr1.delete_if{|i| block}

集合操作

arr1+arr2

arr1-arr2

arr1&arr2