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Daily Challenge #302 - setAlarm

#challenge

Write a function named setAlarm which receives two parameters. The first parameter, employed, is true whenever you are employed and the second parameter, vacation is true whenever you are on vacation.

The function should return true if you are employed and not on vacation (because these are the circumstances under which you need to set an alarm). It should return false otherwise. Examples:

setAlarm(true, true) -> false
setAlarm(false, true) -> false
setAlarm(false, false) -> false
setAlarm(true, false) -> true
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Good luck!

This challenge comes from Swolebrain on CodeWars. Thank you to CodeWars, who has licensed redistribution of this challenge under the 2-Clause BSD License!

Want to propose a challenge idea for a future post? Email yo+challenge@dev.to with your suggestions!

Top comments (5)

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_bkeren profile image
'' •

JS

const setAlarm = (employed,vacation) =>employed && !vacation
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mbaas2 profile image
Michael Baas •

A solution in Dyalog APL:
APL does not have true/false as a dedicated "logical values", but uses 0 or 1 to indicate false/true. So this can be done with a simple calculation: employed multiplied by not(vacation):

{⍺×~⍵}
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Here's the table of all possible results:

      0 1∘.{⍺×~⍵}0 1
0 0
1 0
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OK, I cheated: my fn uses the "dyadic" syntax where you provide a left arg (employed) and a right argument (vacation). I've also written an "enhanced" version that can deal with both syntaxes:

      setAlarm←{⍺←⊃⍵ ⋄ ⍺×~⊃⌽⍵}
      setAlarm 1 1
0
      setAlarm 0 1
0 
      setAlarm 0 0
0 
      setAlarm 1 0
1
     1 setAlarm 0
1
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`

Try it online!

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peter279k profile image
peter279k •

Here is the simple solution with PHP:

function setAlarm(bool $employed, bool $vacation): bool {
  if ($employed === false && $vacation === true) {
    return false;
  }
  return boolval($employed ^ $vacation);
}
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mellen profile image
Matt Ellen-Tsivintzeli •

Enjoy!

function setAlarm()
{
  if((typeof arguments[0]) == 'boolean')
  {
    let [first, second] = arguments;
    return first && setAlarm(second===null?second:!second, null);
  }
  return true;
}
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cipharius profile image
Valts Liepiņš •

Haskell

setAlarm :: Bool -> Bool -> Bool
setAlarm employed vacation = employed && not vacation
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