3 ms·

JS uses the second example

• linkdd 6y ago
  It is because in Javascript everything can be translated to a string: 1 + "hello" == "1hello" Therefore, the type Array can have a join method that have predictable results (unlike Python).
  • Zarel 6y ago
    I don't know what that has to do with `join`'s call order. As mentioned above, it's because Python supports `join` on any sequence, not just the array class. Personally, I find JavaScript's solution neater: [..."hello"].join(" ") === "h e l l o"
    • linkdd 6y ago
      Because when the Javascript engine will try to concatenate all the strings in the Array (the expected behavior of join), it will first translate every object in the array to a string. Javascript always falls back to string, that is also why we have === and == operators. Python's type system is a bit more strict because it will not attempt to serialize your objet if you haven't explicitly done it yourself. My point is: Python doesn't use this notation because it would not make sense in Python.
      • maest 6y ago
        This is also the cause of this lovely bit of JS behaviour: >>> [1,2,10].sort() Array(3) [ 1, 10, 2 ]