1.6 KiB
1.6 KiB
id | title | challengeType | forumTopicId | dashedName |
---|---|---|---|---|
afd15382cdfb22c9efe8b7de | DNA Pairing | 5 | 16009 | dna-pairing |
--description--
The DNA strand is missing the pairing element. Take each character, get its pair, and return the results as a 2d array.
Base pairs are a pair of AT and CG. Match the missing element to the provided character.
Return the provided character as the first element in each array.
For example, for the input GCG
, return [["G", "C"], ["C","G"], ["G", "C"]]
The character and its pair are paired up in an array, and all the arrays are grouped into one encapsulating array.
--hints--
pairElement("ATCGA")
should return [["A","T"],["T","A"],["C","G"],["G","C"],["A","T"]]
.
assert.deepEqual(pairElement('ATCGA'), [
['A', 'T'],
['T', 'A'],
['C', 'G'],
['G', 'C'],
['A', 'T']
]);
pairElement("TTGAG")
should return [["T","A"],["T","A"],["G","C"],["A","T"],["G","C"]]
.
assert.deepEqual(pairElement('TTGAG'), [
['T', 'A'],
['T', 'A'],
['G', 'C'],
['A', 'T'],
['G', 'C']
]);
pairElement("CTCTA")
should return [["C","G"],["T","A"],["C","G"],["T","A"],["A","T"]]
.
assert.deepEqual(pairElement('CTCTA'), [
['C', 'G'],
['T', 'A'],
['C', 'G'],
['T', 'A'],
['A', 'T']
]);
--seed--
--seed-contents--
function pairElement(str) {
return str;
}
pairElement("GCG");
--solutions--
var lookup = Object.create(null);
lookup.A = 'T';
lookup.T = 'A';
lookup.C = 'G';
lookup.G = 'C';
function pairElement(str) {
return str.split('').map(function(p) {return [p, lookup[p]];});
}