Chapter 0-4 Flashcards
In Ruby what is an object?
Literally everything integers characters, text arrays-everything.
what does the method .even? do??
Returns true and false in which the method determines whether the number or variable is even or odd.
What does the .next method do?
It increases the number or variable by plus one.
What do you do if you want to see the all the methods available to the data type?
After the data type put .methods, to see all the available methods.
What does the .index method do?
This method finds the position of the argument in the array and returns that data in the array.
What does the method .between? do??
It is a method to determine if the number lies between two numbers Ex. 2.between? 1,3 Returns true.
What does the .length method do?
It returns the number of characters in a string including spaces.
What is string interpolation?
It is a placeholder that replaces placeholders with values they represent.
What does the method .include? do??
It sorts for a certain number of characters within a string
What does the .start_with? do??
It check to see if a string starts with a certain set of characters.
What does the .end_with? method do??
It checks to see if a string end with a certain set of characters.
What does the .index() method do??
It find a certain set of characters and returns the index of the character or characters.
What does the methods .uppercase and .downcase do?
.uppercase makes the whole string captial letters and downcase puts all the lets to the standard form.
What does the .swapcase method do?
Swap every character in the string to lower case to upper case and vice versa.
What does the method .split do?
Returns an array for a string generally separated by a space(‘’)
What does the .sub() method do??
Takes a substring from a string and replaces it with another substring. But only for the first string it encounters. .sub(old substring, new substring)
What does the .gsub() method do?
Like .sub() method it replaces string with another string but all occurrences for when it is called.
What does the .match method do?
converts a pattern of Regular expressions and invokes its match method on the target String method.
What does the || and && do in Ruby programming?
For if else statements represents or along with and.
How do you negate a expression?
Use the ! point.
What is the ? and : used for?
They mean then and else respectively. ex. number>0? – : —
What does the infinite loop look like?
loop do some code end
What is the break command used for?
Its ends the loop including infinite loop
How do you run a block of code N times?
(some number).times do end
How does one create a new array?
Array.new
How do you find data in an array?
[data][subdata] subdata= data that you are trying to find
What is a reverse index lookup?
Array indexes can also start from the end of the array, rather than the beginning! In Ruby, this is achieved by using negative numbers.
How does a coder increase an array?
after the array use
What does .push() do?
Increases the array with data.
What does the map method do?
sdf
