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itsrachelfish/repl.js

Created May 27, 2020 23:49
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repl.js
let emilypi = ['hey', 'cool', 'list'];
function headOr(list, defaultValue) {
if(list[0] === undefined) {
return defaultValue;
}
return list[0];
}
headOr(emilypi, 'wat');
"hey"
headOr([], 'wat');
"wat"
@emilypi
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emilypi commented May 27, 2020

In haskell, this is

headOr :: a -> [a] -> a
headOr a l = case l of 
  [] -> a
  x:_ -> x

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