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Challenges Merge two strings

Ruby, 40 bytes f=->a,b{b.index(a)==0?b:a[/./m]+f[$',b]} Attempt This Online! If we could assume that string contains only letters and numbers (or to be more specific, no characters like \t\...

posted 3y ago by radarek‭  ·  edited 3y ago by radarek‭

Answer
#4: Post edited by user avatar radarek‭ · 2022-01-21T17:22:20Z (almost 3 years ago)
  • # [Ruby](https://www.ruby-lang.org/), 40 bytes
  • ```ruby
  • f=->a,b{b.index(a)==0?b:a[/./m]+f[$',b]}
  • ```
  • [Attempt This Online!](https://ato.pxeger.com/run?1=m72kqDSpcsGCpaUlaboWNzXSbHXtEnWSqpP0MvNSUis0EjVtbQ3sk6wSo_X19HNjtdOiVdR1kmJrIepvMXqXpBaXKNgq6NoVG-ooFBvpKKRWFKQml6SmKKTkcykoFJSWFCsohQAVZealKyhXFxsCDS4GqajVAXGN4FygEUABjaLU4tIckIlp0RATYzURSpSrYdK2CHvsFdT9vdUVrBTUXYOC_IPUa5W4UvNSuLhALotWd3RydnF1U9cByrq5e3iCGBAhECcWpggMwHKOWNixCLNA4oZGxlBjQCyYJNxkBANJnwtMFE4j6wPjWEiYwuICAA)
  • If we could assume that string contains only letters (or to be more specific, no characters like `\t
  • \v\f \#$()*+-.?[\\]^{|}`) then it could be improved to 36 bytes:
  • ```ruby
  • f=->a,b{b=~/^#{a}/?b:a[/./]+f[$',b]}
  • ```
  • [Attempt This Online!](https://ato.pxeger.com/run?1=m72kqDSpcsGCpaUlaboWN1XSbHXtEnWSqpNs6_TjlKsTa_Xtk6wSo_X19GO106JV1HWSYmsham8xepekFpco2Cro2hUb6igUG-kopFYUpCaXpKYopORzKSgUlJYUKyiFABVl5qUrKFcXG-pl5hWDVNTqgLhGcC7QCKCARlFqcWkOyMS0aIiJsZoIJcrVMGlbhD32Cur-3uoKVgrqrkFB_kHqtUpcqXkpXFwgl0WrOzo5u7i6qesAZd3cPTxBDIgQiBMLUwQGYDlHLOxYhFkgcUMjY6gxIBZMEm4ygoGkzwUmCqeR9YFxLCRMYfEAAA)
  • # [Ruby](https://www.ruby-lang.org/), 40 bytes
  • ```ruby
  • f=->a,b{b.index(a)==0?b:a[/./m]+f[$',b]}
  • ```
  • [Attempt This Online!](https://ato.pxeger.com/run?1=m72kqDSpcsGCpaUlaboWNzXSbHXtEnWSqpP0MvNSUis0EjVtbQ3sk6wSo_X19HNjtdOiVdR1kmJrIepvMXqXpBaXKNgq6NoVG-ooFBvpKKRWFKQml6SmKKTkcykoFJSWFCsohQAVZealKyhXFxsCDS4GqajVAXGN4FygEUABjaLU4tIckIlp0RATYzURSpSrYdK2CHvsFdT9vdUVrBTUXYOC_IPUa5W4UvNSuLhALotWd3RydnF1U9cByrq5e3iCGBAhECcWpggMwHKOWNixCLNA4oZGxlBjQCyYJNxkBANJnwtMFE4j6wPjWEiYwuICAA)
  • If we could assume that string contains only letters and numbers (or to be more specific, no characters like `\t
  • \v\f \#$()*+-.?[\\]^{|}`) then it could be improved to 36 bytes:
  • ```ruby
  • f=->a,b{b=~/^#{a}/?b:a[/./]+f[$',b]}
  • ```
  • [Attempt This Online!](https://ato.pxeger.com/run?1=m72kqDSpcsGCpaUlaboWN1XSbHXtEnWSqpNs6_TjlKsTa_Xtk6wSo_X19GO106JV1HWSYmsham8xepekFpco2Cro2hUb6igUG-kopFYUpCaXpKYopORzKSgUlJYUKyiFABVl5qUrKFcXG-pl5hWDVNTqgLhGcC7QCKCARlFqcWkOyMS0aIiJsZoIJcrVMGlbhD32Cur-3uoKVgrqrkFB_kHqtUpcqXkpXFwgl0WrOzo5u7i6qesAZd3cPTxBDIgQiBMLUwQGYDlHLOxYhFkgcUMjY6gxIBZMEm4ygoGkzwUmCqeR9YFxLCRMYfEAAA)
#3: Post edited by user avatar radarek‭ · 2022-01-21T17:01:28Z (almost 3 years ago)
  • # [Ruby](https://www.ruby-lang.org/), 40 bytes
  • ```ruby
  • f=->a,b{b.index(a)==0?b:a[/./m]+f[$',b]}
  • ```
  • [Attempt This Online!](https://ato.pxeger.com/run?1=m72kqDSpcsGCpaUlaboWNzXSbHXtEnWSqpP0MvNSUis0EjVtbQ3sk6wSo_X19HNjtdOiVdR1kmJrIepvMXqXpBaXKNgq6NoVG-ooFBvpKKRWFKQml6SmKKTkcykoFJSWFCsohQAVZealKyhXFxsCDS4GqajVAXGN4FygEUABjaLU4tIckIlp0RATYzURSpSrYdK2CHvsFdT9vdUVrBTUXYOC_IPUa5W4UvNSuLhALotWd3RydnF1U9cByrq5e3iCGBAhECcWpggMwHKOWNixCLNA4oZGxlBjQCyYJNxkBANJnwtMFE4j6wPjWEiYwuICAA)
  • If we could assume that string contains only letters (or to be more specific, no characters like `\t
  • \v\f \#$()*+-.?[\\]^{|}` then it could be improved to 36 bytes:
  • ```ruby
  • f=->a,b{b=~/^#{a}/?b:a[/./]+f[$',b]}
  • ```
  • [Attempt This Online!](https://ato.pxeger.com/run?1=m72kqDSpcsGCpaUlaboWN1XSbHXtEnWSqpNs6_TjlKsTa_Xtk6wSo_X19GO106JV1HWSYmsham8xepekFpco2Cro2hUb6igUG-kopFYUpCaXpKYopORzKSgUlJYUKyiFABVl5qUrKFcXG-pl5hWDVNTqgLhGcC7QCKCARlFqcWkOyMS0aIiJsZoIJcrVMGlbhD32Cur-3uoKVgrqrkFB_kHqtUpcqXkpXFwgl0WrOzo5u7i6qesAZd3cPTxBDIgQiBMLUwQGYDlHLOxYhFkgcUMjY6gxIBZMEm4ygoGkzwUmCqeR9YFxLCRMYfEAAA)
  • # [Ruby](https://www.ruby-lang.org/), 40 bytes
  • ```ruby
  • f=->a,b{b.index(a)==0?b:a[/./m]+f[$',b]}
  • ```
  • [Attempt This Online!](https://ato.pxeger.com/run?1=m72kqDSpcsGCpaUlaboWNzXSbHXtEnWSqpP0MvNSUis0EjVtbQ3sk6wSo_X19HNjtdOiVdR1kmJrIepvMXqXpBaXKNgq6NoVG-ooFBvpKKRWFKQml6SmKKTkcykoFJSWFCsohQAVZealKyhXFxsCDS4GqajVAXGN4FygEUABjaLU4tIckIlp0RATYzURSpSrYdK2CHvsFdT9vdUVrBTUXYOC_IPUa5W4UvNSuLhALotWd3RydnF1U9cByrq5e3iCGBAhECcWpggMwHKOWNixCLNA4oZGxlBjQCyYJNxkBANJnwtMFE4j6wPjWEiYwuICAA)
  • If we could assume that string contains only letters (or to be more specific, no characters like `\t
  • \v\f \#$()*+-.?[\\]^{|}`) then it could be improved to 36 bytes:
  • ```ruby
  • f=->a,b{b=~/^#{a}/?b:a[/./]+f[$',b]}
  • ```
  • [Attempt This Online!](https://ato.pxeger.com/run?1=m72kqDSpcsGCpaUlaboWN1XSbHXtEnWSqpNs6_TjlKsTa_Xtk6wSo_X19GO106JV1HWSYmsham8xepekFpco2Cro2hUb6igUG-kopFYUpCaXpKYopORzKSgUlJYUKyiFABVl5qUrKFcXG-pl5hWDVNTqgLhGcC7QCKCARlFqcWkOyMS0aIiJsZoIJcrVMGlbhD32Cur-3uoKVgrqrkFB_kHqtUpcqXkpXFwgl0WrOzo5u7i6qesAZd3cPTxBDIgQiBMLUwQGYDlHLOxYhFkgcUMjY6gxIBZMEm4ygoGkzwUmCqeR9YFxLCRMYfEAAA)
#2: Post edited by user avatar radarek‭ · 2022-01-21T17:01:06Z (almost 3 years ago)
  • # [Ruby](https://www.ruby-lang.org/), 40 bytes
  • ```ruby
  • f=->a,b{b.index(a)==0?b:a[/./m]+f[$',b]}
  • ```
  • [Attempt This Online!](https://ato.pxeger.com/run?1=m72kqDSpcsGCpaUlaboWNzXSbHXtEnWSqpP0MvNSUis0EjVtbQ3sk6wSo_X19HNjtdOiVdR1kmJrIepvMXqXpBaXKNgq6NoVG-ooFBvpKKRWFKQml6SmKKTkcykoFJSWFCsohQAVZealKyhXFxsCDS4GqajVAXGN4FygEUABjaLU4tIckIlp0RATYzURSpSrYdK2CHvsFdT9vdUVrBTUXYOC_IPUa5W4UvNSuLhALotWd3RydnF1U9cByrq5e3iCGBAhECcWpggMwHKOWNixCLNA4oZGxlBjQCyYJNxkBANJnwtMFE4j6wPjWEiYwuICAA)
  • # [Ruby](https://www.ruby-lang.org/), 40 bytes
  • ```ruby
  • f=->a,b{b.index(a)==0?b:a[/./m]+f[$',b]}
  • ```
  • [Attempt This Online!](https://ato.pxeger.com/run?1=m72kqDSpcsGCpaUlaboWNzXSbHXtEnWSqpP0MvNSUis0EjVtbQ3sk6wSo_X19HNjtdOiVdR1kmJrIepvMXqXpBaXKNgq6NoVG-ooFBvpKKRWFKQml6SmKKTkcykoFJSWFCsohQAVZealKyhXFxsCDS4GqajVAXGN4FygEUABjaLU4tIckIlp0RATYzURSpSrYdK2CHvsFdT9vdUVrBTUXYOC_IPUa5W4UvNSuLhALotWd3RydnF1U9cByrq5e3iCGBAhECcWpggMwHKOWNixCLNA4oZGxlBjQCyYJNxkBANJnwtMFE4j6wPjWEiYwuICAA)
  • If we could assume that string contains only letters (or to be more specific, no characters like `\t\n\v\f\r \#$()*+-.?[\\]^{|}` then it could be improved to 36 bytes:
  • ```ruby
  • f=->a,b{b=~/^#{a}/?b:a[/./]+f[$',b]}
  • ```
  • [Attempt This Online!](https://ato.pxeger.com/run?1=m72kqDSpcsGCpaUlaboWN1XSbHXtEnWSqpNs6_TjlKsTa_Xtk6wSo_X19GO106JV1HWSYmsham8xepekFpco2Cro2hUb6igUG-kopFYUpCaXpKYopORzKSgUlJYUKyiFABVl5qUrKFcXG-pl5hWDVNTqgLhGcC7QCKCARlFqcWkOyMS0aIiJsZoIJcrVMGlbhD32Cur-3uoKVgrqrkFB_kHqtUpcqXkpXFwgl0WrOzo5u7i6qesAZd3cPTxBDIgQiBMLUwQGYDlHLOxYhFkgcUMjY6gxIBZMEm4ygoGkzwUmCqeR9YFxLCRMYfEAAA)
#1: Initial revision by user avatar radarek‭ · 2022-01-21T16:55:01Z (almost 3 years ago) 
# [Ruby](https://www.ruby-lang.org/), 40 bytes

```ruby
f=->a,b{b.index(a)==0?b:a[/./m]+f[$',b]}
```

[Attempt This Online!](https://ato.pxeger.com/run?1=m72kqDSpcsGCpaUlaboWNzXSbHXtEnWSqpP0MvNSUis0EjVtbQ3sk6wSo_X19HNjtdOiVdR1kmJrIepvMXqXpBaXKNgq6NoVG-ooFBvpKKRWFKQml6SmKKTkcykoFJSWFCsohQAVZealKyhXFxsCDS4GqajVAXGN4FygEUABjaLU4tIckIlp0RATYzURSpSrYdK2CHvsFdT9vdUVrBTUXYOC_IPUa5W4UvNSuLhALotWd3RydnF1U9cByrq5e3iCGBAhECcWpggMwHKOWNixCLNA4oZGxlBjQCyYJNxkBANJnwtMFE4j6wPjWEiYwuICAA)