ruby入门_范围

即Range

比如，1..3 ，1...3

两个点包括末个数值3

三个点不包括3

r1 = 1..5r2 = 1...5r1.each do |var|  print var.to_s+","endputs "------"r2.each do |var|  print var.to_s+","endputs "------"

输出

1,2,3,4,5,------
1,2,3,4,------

使用变量也可以

var = 5r1 = 1..varr1.each do |var|  print var.to_s+","end

输出

1,2,3,4,5,

常用函数，包含，最大值，最小值

r1 = 1..5# includeputs r1.include?(4)puts r1.include?(6)# minputs r1.minputs r1.beginputs r1.first# maxputs r1.maxputs r1.endputs r1.last

输出

true
false
1
1
1
5
5
5

迭代器方法，to_a，reject(排除)，select(包含)，each

reject，转换为数组，排除部分

select，转换为数组，选择部分

r1 = 1..5arr1 = r1.to_aputs "arr1 = #{arr1}"arr2 = r1.reject{|i|i<3}puts "arr2 = #{arr2}"arr3 = r1.select{|i|i<3}puts "arr3 = #{arr3}"r1.each do |var|  print var.to_s+","end

输出

arr1 = [1, 2, 3, 4, 5]
arr2 = [3, 4, 5]
arr3 = [1, 2]
1,2,3,4,5,