How to initialize an array in one step using Ruby

Question

I initialize an array this way   array   Array new array  lt  lt   1   lt  lt   2   lt  lt   3    Is it possible to do that in one step  If so  how

User · Answer

Oneliner   array       lt  lt  1  lt  lt  2  lt  lt  3    this is for fixnums    or   a    w  1 2 3 4 5     or   a      1    3     or   a   Array new 3   1     or   a   Array   1    3

User · Answer

To create such an array you could do   array     1    2    3

User · Answer

To prove There s More Than One Six Ways To Do It   plus 1   1 method     Array new 3   amp plus 1      gt   1  2  3    If 1 method     wasn t possible  you could also do  plus 1   Proc new   n  n   1  Array new 3   amp plus 1      gt   1  2  3    Sure  it s overkill in this scenario  but if plus 1 was a really long expression  you might want to put it on a separate line from the array creation

User · Answer

You can use an array literal   array      1    2    3      You can also use a range   array     1    3   to a    parentheses are required   or array      1    3          parentheses not required  but included for clarity   For arrays of whitespace-delimited strings  you can use Percent String syntax   array    w  1 2 3     You can also pass a block to Array new to determine what the value for each entry will be   array   Array new 3     i   i 1  to s     Finally  although it doesn t produce the same array of three strings as the other answers above  note also that you can use enumerators in Ruby 1 8 7  to create arrays  for example   array   1 step 17 3  to a    gt   1  4  7  10  13  16

User · Answer

You can do  array     1    2    3     As others have noted  you can also initialize an array with  w notation like so   array    w 1 2 3    or   array    w 1 2 3    Please note that in both cases each element is a string  rather than an integer  So if you want an array whose elements are integers  you should not wrap each element with apostrophes   array of integers    1  2  3    Also  you don t need to put comma in between the elements  which is necessary when creating an array without this  w notation   If you do this  which I often did by mistake   as in   wrong array    w 1  2  3    its elements will be three strings ----  1     2     3   So if you do   puts wrong array   the output will be    1  2  3   gt nil   which is not what we want here   Hope this helps to clarify the point

User · Answer

You can simply do this with  w notation in ruby arrays   array    w 1 2 3    It will add the array values 1 2 3 to the arrayand print out the output as   1    2    3

User · Answer

You can initialize an array in one step by writing the elements in    like this   array     1    2    3

User · Answer

Along with the above answers   you can do this too        gt      1    5      remember         gt    1    2    3    4    5

User · Answer

If you have an Array of strings  you can also initialize it like this   array    w 1 2 3   just separate each element with any whitespace

[ruby] How to initialize an array in one step using Ruby?

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