add elment on the first index of an array

[Dirk Einecke]

Hi.

I have an array. Now I will add a element on the first index. I do this
like this:

$a_foo = Array.new
$a_foo = $bar.split('/')
$a_foo = $a_foo.reverse
$a_foo << 'something'
$a_foo = $a_foo.reverse

Is there a shorter way to do this?

greetings
Dirk Einecke

 

[Xavier]

Hi.

I have an array. Now I will add a element on the first index. I do this
like this:

$a_foo = Array.new
$a_foo = $bar.split('/')
$a_foo = $a_foo.reverse
$a_foo << 'something'
$a_foo = $a_foo.reverse

Is there a shorter way to do this?

greetings
Dirk Einecke

Use unshift
e.g.
irb(main):001:0> [1,2,3].unshift(0)
=> [0, 1, 2, 3]


Hth

 

[Dirk Einecke]

Hi Xavier.

Use unshift
e.g.
irb(main):001:0> [1,2,3].unshift(0)
=> [0, 1, 2, 3]

Okay. Thank you. Works fine.

greetings
Dirk Einecke

 

[Linus Sellberg]

Is there a shorter way to do this?

['something'] + $a_foo

 

[Simon Strandgaard]

Is there a shorter way to do this?

['something'] + $a_foo

irb(main):001:0> values=%w(a b c)
=> ["a", "b", "c"]
irb(main):002:0> values[0, 0] = 666
=> 666
irb(main):003:0> p values
[666, "a", "b", "c"]
=> nil
irb(main):004:0>

 

[Kristof Bastiaensen]

Hi.

I have an array. Now I will add a element on the first index. I do this
like this:

$a_foo = Array.new
$a_foo = $bar.split('/')
$a_foo = $a_foo.reverse
$a_foo << 'something'
$a_foo = $a_foo.reverse

Is there a shorter way to do this?

greetings
Dirk Einecke

$a_foo = $bar.split('/').unshift('something')

 

[Martin DeMello]

Hi.

I have an array. Now I will add a element on the first index. I do this
like this:

$a_foo = Array.new
$a_foo = $bar.split('/')

Apart from anything else, note that this is unnecessary in Ruby -
objects are typed, but variables are not. So $a_foo = Array.new just
creates an empty array, and discards it in the next line - $bar.split
creates an entirely new array, to which $a_foo now points.

martin