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Discussion on: Daily Challenge #175 - Complementary DNA

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isaacdlyman profile image
Isaac Lyman • • Edited

This sounds like a one-liner in JS. Let's see...

const DNA_strand = str => str.split('').map(l => l === 'A' ? 'T' : l === 'T' ? 'A' : l === 'G' ? 'C' : l === 'C' ? 'G' : '').join('');
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As a bonus, any non-DNA letters will be ignored.

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vanshxrajput profile image
Vansh.c •

i am fresher can you tell me what does this ( => )operator do.

Your help is appreciated.

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isaacdlyman profile image
Isaac Lyman •

It’s an arrow function (or anonymous function).

function(a, b) {return a + b;}

Is (almost) the same as:

(a, b) => a + b

There are a few differences but most of the time they aren’t anything to worry about. If you care, this is a good overview: levelup.gitconnected.com/7-differe...