How to write X in both Python 3 and JavaScript

Re:How to write X in both Python 3 and JavaScript by mschuetz on Friday September 14, 2018 @10:47AM (#17987554)

Nice list.

Perhabs just personal preference but I'd use

    for(let element of someList){
    	console.log(element);
    }

instead of

    someList.forEach(element => {
      console.log(element)
    })

for...of is easier to read and recognize as a loop construct at first glance, and as far as I recall it's also faster nowadays since the body of the loop is inline, whereas forEach requires the runtime to deal with a function object.

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Re:How to write X in both Python 3 and JavaScript by tuesdayrain on Friday September 14, 2018 @11:02AM (#17987652)

Personally I find the method-style syntax significantly more readable.

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Re:How to write X in both Python 3 and JavaScript by jsh7 on Friday September 14, 2018 @11:08AM (#17987730)

You can also ‘return’ the outer function from within a ‘for...of’ which is pretty useful imo.

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Re:How to write X in both Python 3 and JavaScript by andyfleming on Friday September 14, 2018 @12:40PM (#17988695)

And you can use await in the context of an outer async function, which is a huge advantage in reducing code complexity.

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Re:How to write X in both Python 3 and JavaScript by tormeh on Friday September 14, 2018 @10:52AM (#17987582)

Makes me wonder if maybe the syntax for mapping, folding and other collection operations should have a similar syntax to for instead of the current method-style syntax popular in most modern languages.

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Re:How to write X in both Python 3 and JavaScript by symlinkk on Friday September 14, 2018 @11:16AM (#17987795)

C# has a syntax called Linq Query Syntax that provides keywords in the language to do things like map, filter, and reduce.

Example:

  var queryLondonCustomers = from cust in customers
                             where cust.City == "London"
                             select cust;

I'm not a big fan of it honestly, the function style seems more consistent and easier to read to me.

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Re:How to write X in both Python 3 and JavaScript by hnlauncher on Friday September 14, 2018 @12:18PM (#17988471)

https://www.pyret.org/ does it like this:

  for each(str from [list: "Ahoy", "world!"]):
    print(str)
  end

  for map(n from [list: 1,2,3]): n * n end
  # ==> [list: 1, 4, 9]

  for filter(n from [list: 1, 2, 3]):
    n >= 2
  end
  # ==> [list: 2, 3]

  for fold(sum from 0, n from [list: 4, 5, 6]):
    sum + n
  end
  # ==> 15

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Re:How to write X in both Python 3 and JavaScript by saghm on Friday September 14, 2018 @07:18PM (#17991869)

That sounds a lot like Python list comprehensions

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