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82 lines
1.7 KiB
Markdown
82 lines
1.7 KiB
Markdown
---
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id: afd15382cdfb22c9efe8b7de
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title: DNA Pairing
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challengeType: 1
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forumTopicId: 16009
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dashedName: dna-pairing
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---
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# --description--
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Pairs of DNA strands consist of nucleobase pairs. Base pairs are represented by the characters <em>AT</em> and <em>CG</em>, which form building blocks of the DNA double helix.
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The DNA strand is missing the pairing element. Write a function to match the missing base pairs for the provided DNA strand. For each character in the provided string, find the base pair character. Return the results as a 2d array.
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For example, for the input `GCG`, return `[["G", "C"], ["C","G"], ["G", "C"]]`
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The character and its pair are paired up in an array, and all the arrays are grouped into one encapsulating array.
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# --hints--
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`pairElement("ATCGA")` should return `[["A","T"],["T","A"],["C","G"],["G","C"],["A","T"]]`.
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```js
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assert.deepEqual(pairElement('ATCGA'), [
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['A', 'T'],
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['T', 'A'],
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['C', 'G'],
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['G', 'C'],
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['A', 'T']
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]);
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```
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`pairElement("TTGAG")` should return `[["T","A"],["T","A"],["G","C"],["A","T"],["G","C"]]`.
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```js
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assert.deepEqual(pairElement('TTGAG'), [
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['T', 'A'],
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['T', 'A'],
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['G', 'C'],
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['A', 'T'],
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['G', 'C']
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]);
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```
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`pairElement("CTCTA")` should return `[["C","G"],["T","A"],["C","G"],["T","A"],["A","T"]]`.
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```js
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assert.deepEqual(pairElement('CTCTA'), [
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['C', 'G'],
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['T', 'A'],
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['C', 'G'],
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['T', 'A'],
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['A', 'T']
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]);
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```
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# --seed--
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## --seed-contents--
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```js
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function pairElement(str) {
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return str;
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}
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pairElement("GCG");
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```
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# --solutions--
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```js
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var lookup = Object.create(null);
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lookup.A = 'T';
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lookup.T = 'A';
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lookup.C = 'G';
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lookup.G = 'C';
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function pairElement(str) {
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return str.split('').map(function(p) {return [p, lookup[p]];});
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}
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```
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