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Ruby array access position in array


Ruby array access position in array

By : user2953639
Date : November 21 2020, 01:01 AM
I hope this helps you . I am not sure I understand the question there are many methods of accessing the index for an Array e.g.
code :
 alphabet = ('a'..'z').to_a
 alphabet[0]
 #=> "a"
 alphabet.values_at(2,3,12)
 #=> ["c","d","m"]
 alphabet.index('r')
 #=> 17
 alphabet.fetch(15)
 #=> "p"
@product = Product.find(some_id)
@slot = @product.slot
@slots = Slot.where("id > ?", @slot.id) #return all slots after the @product.slot


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Ruby: next / previous values in array, loop array, array position

Ruby: next / previous values in array, loop array, array position


By : user2890600
Date : March 29 2020, 07:55 AM
I wish did fix the issue. Let's say I have an array of random numbers in no particular order. Let's say these are the ID #'s for people who ran in a marathon, and they're added to the array in the order they finish, something like: , First & Second:
code :
index = race1.find_index(58)
if !index.nil?
  puts "#{race1[index-1], #{race1[index+1] || race1[0]}"
end
require 'linguistics'
Linguistics::use( :en )
race1.each_with_index {|runner, i| puts "runner#{runner}=#{(i+1).en.ordinal}"}
How can i access the value of a ruby array in C? (editing array.c:rb_ary_initialize from ruby source code)

How can i access the value of a ruby array in C? (editing array.c:rb_ary_initialize from ruby source code)


By : Friction Pulse
Date : March 29 2020, 07:55 AM
I wish did fix the issue. , This doesn't make any sense:
code :
result = LONG2NUM(s_arr[i]);
#define LONG2NUM_internal(v) (FIXABLE(v) ? LONG2FIX(v) : rb_int2big(v))
#define INT2FIX(i) ((VALUE)(((SIGNED_VALUE)(i))<<1 | FIXNUM_FLAG))
#define FIX2LONG(x) (long)RSHIFT((SIGNED_VALUE)(x),1)
#define NUM2LONG_internal(x) ((long)(FIXNUM_P(x) ? FIX2LONG(x) : rb_num2long(x)))
#ifdef __GNUC__
#define NUM2LONG(x) \
    __extension__ ({VALUE num2long_x = (x); NUM2LONG_internal(num2long_x);})
#else
static inline long
NUM2LONG(VALUE x)
{
    return NUM2LONG_internal(x);
}
#endif
long result;
for(i = 0; i < len; i++) {
    result = NUM2LONG(s_arr[i]);
    printf("r: %ld\n", result);
}
Create array from single character at a certain position of a different array in Ruby

Create array from single character at a certain position of a different array in Ruby


By : George Sarbu
Date : March 29 2020, 07:55 AM
it fixes the issue
code :
first_character_array = myArray.map{ |e| e[0] }.map{ |e| e.nil? ? "" : e }
=> ["1", "1", "2", "5", "1", "5"] 
...
fifth_character_array = myArray.map{ |e| e[4] }.map{ |e| e.nil? ? "" : e }
=> ["", "5", "", "5", "", "1"] 
Insert into array at specific position based on array content Ruby

Insert into array at specific position based on array content Ruby


By : Beatrice Ebirim
Date : March 29 2020, 07:55 AM
seems to work fine I have an array of objects that are sorted by one of the attributes of this object, and I want to insert another object in there at a position that is determined by that attribute of the object. , Code
code :
def insert_new(arr, new_instance)
  arr.insert(arr.index { |instance| new_instance.score >= instance.score } || -1,
    new_instance)
end
class A
  def initialize(user, score)
    @user, @score = user, score
  end
end

arr = [A.new("Hank", 10), A.new("Lois", 8), A.new("Billy-Bob", 6),
       A.new("Trixy", 4)]
  #=> [#<A:0x007fad7b02fd70 @user="Hank", @score=10>,
  #    #<A:0x007fad7b02fcf8 @user="Lois", @score=8>,
  #    #<A:0x007fad7b02fc80 @user="Billy-Bob", @score=6>,
  #    #<A:0x007fad7b02fbe0 @user="Trixy", @score=4>]

insert_new(arr, A.new("Hubert", 7))
  #=> [#<A:0x007fad7a027450 @user="Hank", @score=10>,
  #    #<A:0x007fad7a0273b0 @user="Lois", @score=8>,
  #    #<A:0x007fad7a850b90 @user="Hubert", @score=7>,
  #    #<A:0x007fad7a027310 @user="Billy-Bob", @score=6>,
  #    #<A:0x007fad7a027270 @user="Trixy", @score=4>] 
insert_new(arr, A.new("Zelda", 2))
  #=> [#<A:0x007fad7a027450 @user="Hank", @score=10>,
  #    #<A:0x007fad7a0273b0 @user="Lois", @score=8>,
  #    #<A:0x007fad7a850b90 @user="Hubert", @score=7>, 
  #    #<A:0x007fad7a027310 @user="Billy-Bob", @score=6>,
  #    #<A:0x007fad7a027270 @user="Trixy", @score=4>,
  #    #<A:0x007fad7b876128 @user="Zelda", @score=2>]
insert_new(arr, A.new("Slim", 8))
  #    Slim is inserted between Hank and Lois
insert_new(arr, A.new("Rhonda", 8))
  #    Rhonda is inserted between Hank and Slim
arr.index { |instance| new_instance.score >= instance.score } #=> nil
How can I multiply a number in an array by its position in the array and then add up the sum of the array in ruby?

How can I multiply a number in an array by its position in the array and then add up the sum of the array in ruby?


By : Afia
Date : March 29 2020, 07:55 AM
will be helpful for those in need You can monkey patch the Array class if you want the method to be available to all arrays:
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