From Objective-C to Ruby(1)-流程控制

流程控制

判断

if···elsif···else···

OC:

NSInteger day = 5;

if (day==0) {
    NSLog(@"星期日");
}else if (day==6){
    NSLog(@"星期六");
}else {
    NSLog(@"工作日");
}

ruby:

day = 5

if day==0
    puts "星期日"
elsif day==6
    puts "星期六"
else
    puts "工作日"
end

三目运算符

OC:

NSInteger day = 5;
NSString * result = (day==6 || day==0) ? @"休息日" : @"工作日";
NSLog(@"%@", result);

ruby:

day = 5;
result = (day==6 || day==0) ? "休息日" : "工作日";
puts result

case ... when ...

OC:

NSInteger day=5;

switch (day) {
    case 1:
        NSLog(@"工作日-星期一");
        break;
    
    case 2:
        NSLog(@"工作日-星期二");
        break;
    
    case 3:
        NSLog(@"工作日-星期三");
        break;
        
    case 4:
        NSLog(@"工作日-星期四");
        break;
    
    case 5:
        NSLog(@"工作日-星期五");
        break;
    
    case 6:
        NSLog(@"休息日-星期六");
        break;
    
    case 0:
        NSLog(@"休息日-星期日");
        break;
        
    default:
        NSLog(@"未知");
    }

ruby:

day = 5

case day
when 1..5
    puts "工作日"
when 0
    puts "星期日"
when 6
    puts "星期六"
else
    puts "未知"
end

循环

while

OC:

NSInteger counter = 0;

while (counter < 5) {
    NSLog(@"hi, %ld", counter);
    counter += 1;
}

ruby:

counter = 0

while counter < 5
  puts "hi, #{counter}"
  counter += 1
end

for in

OC:

NSMutableArray * thoughts =  @[@"儒家", @"道家", @"墨家", @"法家"].mutableCopy;
for (NSString * thought in thoughts) {
    NSLog(@"%@", thought);
}

ruby:

thoughts = ["儒家", "道家", "墨家", "法家"]
for thought in thoughts
    puts thought
end

upto & downto

OC:

for (NSInteger i = 1; i <= 5 ; i++) {
    NSLog(@"hi, %ld", i);
}
/*
hi, 1
hi, 2
hi, 3
hi, 4
hi, 5
*/


for (NSInteger i = 5; i >= 1 ; i--) {
    NSLog(@"hi, %ld", i);
}
/*
hi, 5
hi, 4
hi, 3
hi, 2
hi, 1
*/

ruby:

1.upto(5) do |i|
  puts "hi, #{i}"
end

=begin
hi, 1
hi, 2
hi, 3
hi, 4
hi, 5
=end


5.downto(1) do |i|
  puts "hi, #{i}"
end

=begin
hi, 5
hi, 4
hi, 3
hi, 2
hi, 1
=end

iteration

OC:

NSMutableArray * thoughts =  @[@"儒家", @"道家", @"墨家", @"法家"].mutableCopy;
[thoughts enumerateObjectsUsingBlock:^(id  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
    NSString * thought = obj;
    NSLog(@"%@", thought);
}];

ruby:

thoughts = ["儒家", "道家", "墨家", "法家"]
thoughts.each do |thought|
    puts thought
end

---

参考资料：
railsbook

---

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• 若有更好的资料，感谢交流。
• 若有错误的内容，感谢斧正。