FCC-learning notes DNA Pairing, fcc-pairing

FCC-learning notes DNA Pairing, fcc-pairing

FCC-Study Notes DNA Pairing

1> I recently studied and practiced FCC questions. This is really good. I recommend it to you.

2> Chinese Version address: https://www.freecodecamp.cn/?english version address: https://www.freecodecamp.org

3> This time I wrote a question about JS called DNA Pairing.

The rules are as follows:

The DNA chain lacks a paired base. Find the matched Base Based on each base and return the result as the second array.

Base pairs (Base pair) is a pair of AT and CG, matching the missing Base for a given letter.

Returns the given letter as the first base in each array.

For example, for the input GCG, [["G", "C"], ["C", "G"], ["G ", "C"]

The letters and the matching letters are in a number group, and all arrays are organized and encapsulated into an array.

 

4> the code I wrote is implemented as follows:

 

function pairElement(str) {  var result=[];  var item=[];  for(var i=0;i<str.length;i++){    if(str[i]=="A"){      item=["A","T"];    }else if(str[i]=="T"){      item=["T","A"];    }else if(str[i]=="C"){      item=["C","G"];    }else if(str[i]=="G"){      item=["G","C"];    }    result.push(item);    item=[];  }  return result;}pairElement("CTCTA");pairElement("TTGAG");pairElement("GCG");

5> if there is a better method or a simple implementation, please let me know and make progress together!