Seven weeks and seven languages-ruby-Day 1: Find a nanny

I feel that I will soon forget what I learned and will not leave anything. I read "seven weeks and seven languages" this time and record what I think is useful for future reference, this should be the beginning of the record.

Ruby is an object-oriented, interpreted, and dynamic scripting language.Object-orientedIt indicates that the language has the characteristics of encapsulation, inheritance, and polymorphism;Interpreted typeIt means that it is executed by the interpreter rather than the compiler;Dynamic typeThat is, the type is bound at runtime rather than during compilation;Script Language, It indicates that it is very short! Easy to use! It is interpreted and executed only during the call.

Programming Model: All objects, from a number to a bool value, are defined as objects and have their own methods.

JudgmentStructure: Both block and row formats are supported.

LogicJudgment: Logical judgment is only performed to the position where the value can be obtained. & and are both logical and. | and or are both logical or

RUby API documentation: Http://www.ruby-doc.org/core-2.0/

Programming Ruby: Http://www.ruby-doc.org/docs/ProgrammingRuby/

Method for replacing a part of a character: String # sub, string # gsub, string # Tr and string # []

Ruby regular expression:

Here are some common examples.

Matching character:

# \ D Number

# \ W letters and numbers

# \ S empty characters

Matching Method:

# = ~ The result is the matching position.

1 "aaaa1" = ~ /\ D/

# Match indicates the matched characters.

1/\ D/. Match ("aaaa1 ")

RUby region (range):

Generally, "..." or "..." is added between characters or numbers to indicate a range. This range is also an object !!

Include? Method: used to determine whether a value is in this region or not.

1 (1 .. 100). Include? (50)

Self-study:

1. Print the string "Hello, world"

1 p "Hello, world ."

2. Find the subscript "Ruby." in "Hello, Ruby .".

1 "Hello, Ruby." = ~ /Ruby ./

3. print your name ten times

1 10. Times {P "wyp "}

4. Print "This is 1" and 1 will change from 1 to 10.

X = 1

While x <= 10

P "this is # {x }"

X = x + 1

End

5. Run the ruby program from a file

Use RB as the file suffix, and then run it directly using the ruby command.

~ $ Ruby filename. Rb

Finally, I found a good online Ruby reference manual when I checked the information, recording it to prevent myself from forgetting: http://www.kuqin.com/rubycndocument/man/index.html