dna pairing, pushing array inside an array

dna pairing, pushing array inside an array

function pair(str) {      var dna = [];    var dnaarr = [];        for(var i = 0; i < str.length; i++) {          if(str[i].indexOf('G') === 0) {          var a = dna.push('C');        }        if(str[i].indexOf('C') === 0) {          var b = dna.push('G');        }        if(str[i].indexOf('A') === 0) {          var c = dna.push('T');        }        if(str[i].indexOf('T') === 0) {          var d = dna.push('A');        }        }      for(var j = 0; j < str.length; j++) {        var e = dnaarr.push(str[j]);        var f = dnaarr.push(dna[j]);      }        return dnaarr;  }    pair("ATGCG");  

When I run this code, it returns

[ 'A', 'T', 'T', 'A', 'G', 'C', 'C', 'G', 'G', 'C' ]  

I need it to return

[['A', 'T'], ['T', 'A'], ['G', 'C'], ['C','G'], ['G', 'C']]  

Could anyone please help me with this code?

Answer by tkay for dna pairing, pushing array inside an array

It was a problem with your array pushes.

function pair(str) {         var dnaarr = [];    //var dnatot = [];        for(var i = 0; i < str.length; i++) {           var dna = [];  dna.push(str[i]); //pushing current str[i]        if(str[i].indexOf('G') === 0) {          var a = dna.push('C');        }        if(str[i].indexOf('C') === 0) {          var b = dna.push('G');        }        if(str[i].indexOf('A') === 0) {          var c = dna.push('T');        }        if(str[i].indexOf('T') === 0) {          var d = dna.push('A');        }  dnaarr.push(dna); //pushing the array dna to the main array dnaarr      }             return dnaarr;  }    console.log(pair("ATGCG"));

Answer by Veo for dna pairing, pushing array inside an array

Here's a simpler version:

function pair(str)  {      // Array to hold the pairs      var dna = [];      // Loop through the string      for (var i = 0; i < str.length; i++) {          // Switch based on the current letter in the string          // Push an array to dna with the current string and it's pair          // in the case of 'G' the array would be ['G','C']          // dna would then be [['G','C']]          switch(str[i])          {              case "G":                  dna.push([str[i],"C"]);                  break;              case "C":                  dna.push([str[i],"G"]);                  break;              case "A":                  dna.push([str[i],"T"]);                  break;              case "T":                  dna.push([str[i],"A"]);                  break;          };      }      // return the array      return dna;  }    pair("ATGCG")  

Answer by PGGalaviz for dna pairing, pushing array inside an array

Another, probably simpler and cleaner, version of it:

function pair(str) {    var arr = str.split(''),        newArr = [];      arr.forEach(function(e){        if (e == 'A') {        newArr.push([e, 'T']);      } else if (e == 'T') {        newArr.push([e, 'A']);      } else if (e == 'G') {        newArr.push([e, 'C']);      } else {        newArr.push([e, 'G']);      }      });       return newArr;  }  

Example:

pair('GATC');  

will return:

[['G','C'], ['A','T'], ['T', 'A'], ['C', 'G']]   

Answer by Mason Shin for dna pairing, pushing array inside an array

function pair(str) {    // object of dna paring key, value    var pairing = {          "A": "T",          "T": "A",          "C": "G",          "G": "C"        },        // array to store paired object        final = [];    // make an array by .split and map that array by using the dna paring object    final = str.split('').map(function(val) {      var arr = [];      arr.push(val, pairing[val]);      return arr;    });      // return the array of paired objects    return final;  }  

Answer by Yup. for dna pairing, pushing array inside an array

I found this approach to be the most readable. Explanation in comments

function pairElement(str) {    // base pairs defined by proj requirements    var basePairs = {"A": "T", "T": "A", "C": "G", "G": "C"};    var newGeneCodeArr = [];    for (var i = 0; i < str.length; i++) {      // build individual sequence pair that fits requirements      var newGeneCode = [];      newGeneCode.push(str[i]);      newGeneCode.push(basePairs[str[i]]);      newGeneCodeArr.push(newGeneCode);    }    return newGeneCodeArr;  }  

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