DEV Community: roxor

First Half. Ruby noob question

roxor — Thu, 28 Apr 2022 16:18:13 +0000

I'm doing some exercises in ruby, my task was this

Write a method **first_half(array)** that takes in an array and returns a new array containing the first half of the elements in the array. If there is_ an odd number of elements_, return the first half including the middle element.

My solution was this

def first_half(array)
  new_arr = []
  i = 0
  while i < array.length / 2.0
    new_arr << array[i]

    i += 1
  end

  return new_arr

end

print first_half(["Brian", "Abby", "David", "Ommi"])# => ["Brian", "Abby"]
puts
print first_half(["a", "b", "c", "d", "e"]) # => ["a", "b", "c"]

end this works, but when I change 2.0 to 2.5 editor show only my first two elements "a" and "b". Any explanation why?
Maybe I just overthink this and this is something stupid...

I just want to hear different thoughts

thanks in advance <3

100 days of coding - Day 3

roxor — Thu, 20 Jan 2022 21:01:07 +0000

Methods

Method or Function?

Don't have a clue what is difference between two of these, but for now most important to learn how they working. Later I will write about differences

In Ruby we will called this methods.

Parentheses?
Ruby is very flexible language. When method expect some results we use parentheses, if not we don't need parentheses. But methods will works in both cases. See example bellow

def something
   puts "Hello World"
end

# this is two valid ways to call the _something_ methods

something  # this is preferred since something methods 
doesn't expect any parameters

something()

However, we prefer to call methods with parentheses in that scenario

def something(name)
  puts "hey" + name
end

something("Ivan") # this is preferred since greet does 
expect parameters

something "Ivan"

We also must make distinction between a variable, parameter and argument.

Variables are names who can hold the data.

bottle = water

bottle is variable that hold value "water"

*Parameter * are names that can hold a data in method.
Parameter is placed in parentheses of method.

def something(drink, eat)
    sentence =  "I like to eat " + food + " with a cup of "            
                + drink
    puts sentence
end

Above food and drink are parameters. sentence is a normal variable; it is not a parameter:

Arguments are data that we pass in method when we call the method.

def meal(food, drink)
  sentence =  "I like to eat " + food + " with a cup of " + drink
  puts sentence
end

meal("toast", "coffee") # Here we pass "toast" and "coffee" into our method.
meal("pancakes", "orange juice") # We can also pass "pancakes" and "orange juice" in another call

"toast", "coffe", "pancakes", "orange juice" are arguments

100 days of coding - Day 2

roxor — Wed, 19 Jan 2022 21:00:22 +0000

okay, for this day I do

1. Strings

Different waves to print and format your code.
P, print, puts.
String operations: + (concatenation), .length, and

Exercies:
**What is the index of g in the string "coding"?
**What will "Hey-Programmers".length < 5 evaluate to?
**What will "coding"[2] evaluate to?

2. Variables

Exercising

Predict what the following puts lines with question marks will print out

num = 40
num + 5
puts "---1:"
puts num # ?

num += 2
puts "---2:"
puts num # ?

isEven = num % 2 == 0
puts "---3:"
puts isEven # ?

isNegative = num < 0
puts "---4:"
puts isNegative # ?

puts "---5:"
puts isEven || isNegative # ?

puts "---6:"
puts isEven && isNegative # ?

puts "---7:"
puts isEven && !isNegative # ?

100 days of coding - Day 1

roxor — Tue, 18 Jan 2022 14:55:03 +0000

I've been trying to get into the world of programming for a while now, but I always give up. Now I’m starting again and I want this to be my proof that I didn’t give up no matter how hard it was.

I’m starting to learn through AppAcademy.

For this day(Day 1 of 100), I decided to go for:

Numbers

2.Booleans

exercise

roxor — Sun, 19 Dec 2021 15:25:17 +0000

Create a new string sorted from smallest to largest.

JavaScript beginner help

roxor — Sun, 16 Feb 2020 18:58:03 +0000

Hey guys,

I have been studying JavaScript for 3 weeks already. I'm stuck with function and these 3 tasks. If anyone could help me I would really appreciate it:

Write sum function that returns the sum of cubes of numbers from n to m.
Call the function and print its result in the console.
Write function year that passes the Birth parameter.
Birth year parameter represents the birth year of a person. The function should return how old a person is.
The number of years a person has calculated based on their birth year and the current year that you can pull from your computer.
Call the function and print the result in the console.
Write function divisible by passing three parameters n, m and k. The function on the screen should print the number of numbers n to m that is divisible by k. Call the function