Insert at index

ruby-talk
1

Hi,
Is there any alternative for insert in string. I need to insert
different
characters at different indices using a loop, but since insert modifies
the string it goes wrong.
Please help.

···

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2

I'm not sure I understand the full question, but since you are looping, one way to do this:

new_variable = old_string.split(/(your value here)/)

new_variable is an array so then you can do this:

new_variable.each_with_index do | value, index |

         # Your code here to make the change
        # then just substitute the new change like this:

        new_variable(index) = (your new code/variable)

end

# Then just put your array back into a string using .join.

Wayne

···

On Sep 24, 2012, at 6:34 AM, Geena Tho wrote:

Hi,
Is there any alternative for insert in string. I need to insert
different
characters at different indices using a loop, but since insert modifies
the string it goes wrong.
Please help.

3

Thank you Wayne, But

(0..n-1).each do |i|
    st.insert(i,ch)
end
This is my code, st is my string. I need to insert a character, say ch.
n is 3

for example, if st = 'ab' and ch = 'c' i get:
abc
aabc
aaabc
But the desired output is
abc
bac
bca

···

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4

Geena Tho wrote in post #1077284:

Hi,
Is there any alternative for insert in string. I need to insert
different
characters at different indices using a loop, but since insert modifies
the string it goes wrong.
Please help.

str="foobar"

=> "foobar"

str[0...3]+"x"+str[3..-1]

=> "fooxbar"

str

=> "foobar"

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5

The last two outputs have order of "a" and "b" reversed - that can
never be the result of simply inserting something into "ab". Are
those typos or is it intentional? If it is intentional, what is it
that you _really_ want?

In case of type, please have a look:

irb(main):001:0> st = 'ab'
=> "ab"
irb(main):002:0> ch = 'c'
=> "c"
irb(main):003:0> 3.times {|i| puts st.dup.insert(i, ch)}
cab
acb
abc
=> 3

Kind regards

robert

···

On Mon, Sep 24, 2012 at 2:28 PM, Geena Tho <lists@ruby-forum.com> wrote:

Thank you Wayne, But

(0..n-1).each do |i|
    st.insert(i,ch)
end
This is my code, st is my string. I need to insert a character, say ch.
n is 3

for example, if st = 'ab' and ch = 'c' i get:
abc
aabc
aaabc
But the desired output is
abc
bac
bca

--
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/

6

Robert Klemme wrote in post #1077298:

In case of type, please have a look:

irb(main):001:0> st = 'ab'
=> "ab"
irb(main):002:0> ch = 'c'
=> "c"
irb(main):003:0> 3.times {|i| puts st.dup.insert(i, ch)}
cab
acb
abc
=> 3

Kind regards

robert

coooool,..

it works, st.dup was what i was searching for

Thank you:-)

···

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