ruby字符串截取字符串

Ruby| 倒弦 (Ruby | Reversing string)

Here, we are implementing a Ruby program to reverse a string.

在这里，我们正在实现一个Ruby程序来反转字符串。

Methods used:

使用的方法：

• gets: This method is a public instance method of String class which is used to take input from the console.

  gets ：此方法是String类的公共实例方法，用于从控制台获取输入。

• puts: This method is a public instance method of String class which is used to print Strings on the console.

  puts ：此方法是String类的公共实例方法，用于在控制台上打印String。

• reverse: This method is a public instance method of String class which is used to reverse the String object.

  reverse ：此方法是String类的公共实例方法，用于反转String对象。

• split: This method is a public instance method of String class which is used to convert the String into array instance.

  split ：此方法是String类的公共实例方法，用于将String转换为数组实例。

• length: This method is a public instance method of String class which is used to find the number of characters present in the String.

  length ：此方法是String类的公共实例方法，用于查找String中存在的字符数。

• times: This is a kind of loop through which the statement iterates for a given number of times.

  times ：这是一种循环，语句可循环执行给定次数。

• push: This method is used to add character to the array object.

  push ：此方法用于向数组对象添加字符。

• pop: This method is used to remove the character from the array object.

  pop ：此方法用于从数组对象中删除字符。

• join: This method is used to covert the Array object into the String.

  join ：此方法用于将Array对象隐藏到String中。

Example 1: Without using library method reverse

示例1 ：不使用库方法反向

=begin  Ruby program to reverse a String.		=enddef rev_str(str)  s_str = str.split("")  new_str = []  str.length.times{
   new_str.push(s_str.pop)}  new_str.joinendputs "Enter the String you want to reverse:"string = gets.chompputs "The reversed String is #{rev_str(string)}"

Output

输出量

Enter the String you want to reverse: includehelp.comThe reversed String is moc.plehedulcni

Explanation:

说明：

In the above code, you can observe that we have defined a function that is responsible for reversing the String object. First, we have converted the String into an Array object then after processing it, we have converted it back to a String object.

在上面的代码中，您可以观察到我们已经定义了一个函数，该函数负责反转String对象。 首先，我们将String转换为Array对象，然后在对其进行处理后，将其转换回String对象。

Example 2:

范例2：

=begin  Ruby program to reverse a String.		=endputs "Enter the String you want to reverse:"string = gets.chomprev_string = string.reverseputs "The reversed String is #{rev_string}"

Output

输出量

RUN 1:Enter the String you want to reverse: includehelp.comThe reversed String is moc.plehedulcniRUN 2:Enter the String you want to reverse: Hello World!The reversed String is !dlroW olleH

Explanation:

说明：

In the above code, you can observe that we have invoked the method which is a public instance method defined in Ruby's library for reversing the String. For creating the permanent changes in the String you can invoke .

在上面的代码中，您可以观察到我们调用了方法，这是在Ruby的库中定义的用于反转String的公共实例方法。 为了在字符串中创建永久更改，您可以调用 。

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ruby字符串截取字符串