Nice article! Nicely done, too. This really touches the basic ideaal that cover some well known JS pitfalls. There are, however, 2 things I would like to debate.
First of which, when comparing 42 with "42", I think it does not convert to number, but to string instead (widening).
Secondly, the findMissing() method is a nice algorithm, bit not so usefull as it's currently data aware, meaning that it now only works if 1 element is used only once in the input array. If, let's say, both 1 and 7 are each used only once, I guess it returns 8 (not actually tester this!). 8 is not in the array, so that would need further processing. If 0 elements are used once, it returns 0, which might not even be in the array. If it is, is it then used once? No way to tell. Instead, create a map of unique vales, and just keep a count. Boring, but it works ;)
Hey Kasper, thanks for the feedback and the suggestions. Debates are always welcome. I have created these notes by referring to 'You find know JS' by getify on github. And there it says that the string 42 will get converted to number. github.com/getify/You-Dont-Know-JS...
Also, in the findOne problem, I had assumed that only one numner would appear once, though the Map() based solution makes sense too :)
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Nice article! Nicely done, too. This really touches the basic ideaal that cover some well known JS pitfalls. There are, however, 2 things I would like to debate.
First of which, when comparing 42 with "42", I think it does not convert to number, but to string instead (widening).
Secondly, the
findMissing()method is a nice algorithm, bit not so usefull as it's currently data aware, meaning that it now only works if 1 element is used only once in the input array. If, let's say, both 1 and 7 are each used only once, I guess it returns 8 (not actually tester this!). 8 is not in the array, so that would need further processing. If 0 elements are used once, it returns 0, which might not even be in the array. If it is, is it then used once? No way to tell. Instead, create a map of unique vales, and just keep a count. Boring, but it works ;)Hey Kasper, thanks for the feedback and the suggestions. Debates are always welcome. I have created these notes by referring to 'You find know JS' by getify on github. And there it says that the string 42 will get converted to number. github.com/getify/You-Dont-Know-JS...
Also, in the findOne problem, I had assumed that only one numner would appear once, though the Map() based solution makes sense too :)