trans string into array

[Pen Ttt]

a=[1,2,3]
=> [1, 2, 3]
irb(main):008:0> b=[4,5,6]
=> [4, 5, 6]
irb(main):009:0> a[1]+b
TypeError: Array can't be coerced into Fixnum
from (irb):9:in `+'
from (irb):9
from :0
irb(main):010:0> a[1].to_a+b
(irb):10: warning: default `to_a' will be obsolete
=> [2, 4, 5, 6]

is there better way to change string into array?
a[1].to_a will be obsolere

 

[Ryan Davis]

a=[1,2,3]
=> [1, 2, 3]
irb(main):008:0> b=[4,5,6]
=> [4, 5, 6]
irb(main):009:0> a[1]+b
TypeError: Array can't be coerced into Fixnum
from (irb):9:in `+'
from (irb):9
from :0
irb(main):010:0> a[1].to_a+b
(irb):10: warning: default `to_a' will be obsolete
=> [2, 4, 5, 6]

is there better way to change string into array?
a[1].to_a will be obsolere

What string?

 

[Abinoam Jr.]

Are you trying inserting an Integer at the begining of an Array?

irb(main):009:0> a[1]+b ...
is there better way to =A0change string into array?
a[1].to_a will be obsolere

 

[Peter Vandenabeele]

Pen Ttt wrote in post #971595:

a=[1,2,3]
=> [1, 2, 3]
irb(main):008:0> b=[4,5,6]
=> [4, 5, 6]
irb(main):009:0> a[1]+b
TypeError: Array can't be coerced into Fixnum
from (irb):9:in `+'
from (irb):9
from :0
irb(main):010:0> a[1].to_a+b
(irb):10: warning: default `to_a' will be obsolete
=> [2, 4, 5, 6]

is there better way to change string into array?
a[1].to_a will be obsolere

If you want to create the array [2,4,5,6] then
there are 2 proper ways:

b=[4,5,6] => [4, 5, 6]
b.unshift(a[1]) # insert this _element_ at the front

=> [2, 4, 5, 6]

or

b=[4,5,6] => [4, 5, 6]
a[1..1]+b # a[1..1] creates the sub-array of from position 1 to 1

=> [2, 4, 5, 6]

And if you wanted the to_a functionality, then check Kernel.Array
(but that has unneeded conversions away from and back to an Array)

b=[4,5,6] => [4, 5, 6]
Array(a[1]) + b

=> [2, 4, 5, 6]

I assume you say "string" but really mean 2 (which is an object
of Fixnum class):

a[1].class

=> Fixnum

HTH,

Peter

 

[Brian Candler]

Pen Ttt wrote in post #971595:

a=[1,2,3]
=> [1, 2, 3]
irb(main):008:0> b=[4,5,6]
=> [4, 5, 6]
irb(main):009:0> a[1]+b
TypeError: Array can't be coerced into Fixnum

But you can concatenate two arrays, is this what you want?

[a[1]] + b