Common functions of the "Ruby Learning Note" string

String is the most commonly used class in almost all object-oriented programming languages, and is no exception in Ruby, which is documented in several common methods of string in Ruby.

Concat: Connect 2 strings, sample:

<span style= "FONT-FAMILY:SIMSUN;FONT-SIZE:18PX;" >puts "Hello". Concat ("world!") </span>

Output: Hello world!

Capitalize: Even the first letter uppercase, the other letter lowercase, example:

<span style= "FONT-FAMILY:SIMSUN;FONT-SIZE:18PX;" >puts "Hello world!". Capitalize () </span>

Output: Hello world!

Downcase: Convert to lowercase, sample:

<span style= "FONT-FAMILY:SIMSUN;FONT-SIZE:18PX;" >puts "Hello world!". Downcase () </span>

Output: Hello world!

UpCase: Capitalization, example:

<span style= "FONT-FAMILY:SIMSUN;FONT-SIZE:18PX;" >puts "Hello world!". UpCase () </span>

Output: HELLO world!

Swapcase: Case reversal, Sample:

<span style= "FONT-FAMILY:SIMSUN;FONT-SIZE:18PX;" >puts "Hello". Swapcase () </span>

Output: HELLO

Chop: Delete the character at the end, sample:

<span style= "FONT-FAMILY:SIMSUN;FONT-SIZE:18PX;" >puts "Hello World". Chop () </span>

Output: Hello worl

Hash: Get hash value, sample:

<span style= "FONT-FAMILY:SIMSUN;FONT-SIZE:18PX;" >puts "Hello world!". Hash () </span>

Output: 224243329

Next: The Last word Fugai, example:

<span style= "FONT-FAMILY:SIMSUN;FONT-SIZE:18PX;" >puts "Hello World". Next () </span>

Output: Hello Worle

Reverse: Reverse order, Sample:

<span style= "FONT-FAMILY:SIMSUN;FONT-SIZE:18PX;" >puts "Hello". Reverse () </span>

Output: Olleh

Sum: Sum the values corresponding to each character, for example:

<span style= "FONT-FAMILY:SIMSUN;FONT-SIZE:18PX;" >puts "Hello". Sum () </span>

Output: 532

Common functions of the "Ruby Learning Note" string