I have summarized the differences between slice and slice !. I would appreciate it if you could comment and point out any expressions that are easier to understand!
--slice and slice! - slice - slice!
--Practice --Problem --Answer (commentary)
[Example] Extract the first element from the array and output the original array
--Methods that can retrieve specified elements from arrays and strings --Numeric when specifying elements --Starting from 0
array = [0, 1, 2, 3, 4, 5] num = array.slice(1) puts num puts array #Terminal #result of puts num # 1 # =>Extract specified element # puts array # 0 # 1 # 2 # 3 # 4 # 5
--A method with an exclamation mark (!) Is called a destructive method. --Not only extract elements but also change their original shape --Delete the specified element
array = [0, 1, 2, 3, 4, 5] num = array.slice!(1) puts num puts array #Terminal #result of puts num # 1 # =>The elements that can be taken do not change # puts array # 0 # 2 # 3 # 4 # 5 # =>Extracted element (1) has been deleted
Let's solve the problem using
slice using fruits as an example.
Let's create a method that deletes the nth character from any character and outputs that character!
def str_check(string, num) #String(string)And what number do you want to delete(num)Have received string.slice!(num - 1) #Because it starts from the 0th-You can delete the characters you want to retrieve by doing 1. puts string # slice!You can output characters other than those deleted with end #Method call str_check('apple', 1) str_check('orange', 2) str_check('grape', 4) #Terminal output result # pple # oange # grae
--Elements can be retrieved from strings and arrays by using the
--Specify a number when you want to retrieve an element
--Starting from 0th
--You can change the shape of the original string or array by using the
-Ruby 3.0.0 Reference Manual [slice]
-Ruby 3.0.0 Reference Manual [slice!]