How to do it...

Before we start coding, let's take a look at the FASTQ file, in which you will have many records, as shown in the following code:


Line 1 starts with @, followed by a sequence identifier and a description string. The description string will vary from a sequencer or a database source, but will normally be amenable to automated parsing.

The second line has the sequence DNA, which is just like a FASTA file. The third line is a +, sometimes followed by the description line on the first line.

The fourth line contains quality values for each base that's read on line two. Each letter ...

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