红宝石 |字符串删除前缀！方法

删除前缀！是 Ruby 中的 String 类方法，用于返回给定字符串的副本，其中前导前缀已删除，如果未进行任何更改，则返回 nil。

Syntax: str.delete_prefix

Parameters: Here, str is the given string.

Returns: A copy of the given string with leading prefix deleted or nil if no change was made.

示例 1：

# Ruby program to demonstrate 
# the delete_prefix! method 
       
# Taking a string and 
# using the method
puts "Ruby".delete_prefix!("Ru")
puts "Class".delete_prefix!("Cl")

输出：

by
ass

示例 2：

# Ruby program to demonstrate 
# the delete_prefix! method 
       
# Taking a string and 
# using the method
puts "Sample".delete_prefix!("am")
puts "Input".delete_prefix!("In")

输出：

put