diogobaltazar

# python
> (_, _, x) = [1, 2, 3] # not with len > 3
> x
3

// js
> (([head, ...tail]) => tail.concat(head))([1, 2, 3, 4, 5])

diogobaltazar

# python
> print (lambda _: _.format(_))('+{}+')
"++{}++"

> print "{a} and {b}".format(b = 'b', a = 'a')
"a and b"

diogobaltazar

// js

//***************************************************************************
// USE CASE
// 
// SUM first 100 even integers
//***************************************************************************

n = [...Array(100).keys()]      // get indexes starting at 0

diogobaltazar

// js
> ((x, y) => (w => w + x + y)(0))(1, 2)
3

# python
> print (lambda x, y: (lambda w : w + x + y)(0))(1, 2)
3

diogobaltazar

> [{a:1}, {b:2}, {c:3}].reduce((acc, o) => {return Object.assign(acc, o)}, {})
{a: 1, b: 2, c: 3}

> e = {a: 1}
> e = {...e, b: 1}
{a: 1, b: 2}

// Creating object attributes with names of array elements
> arr = ['a', 'b', 'c']
> Object.assign(...arr.map((attr, index) => {return {[attr]: index}}), {})

diogobaltazar

> [1, 2, 3].map((_, e) => {return {[e]:e}}) // or simply  e => ...
[{…}, {…}, {…}]
  0: {1: 1}
  1: {2: 2}
  2: {3: 3}

> a = {b: {c: {}}}
> a.b.c["d"] = a
> a
  b:

diogobaltazar

db.system.js.save({
    _id: 'prt'
    , value: (...args) => {
        args.forEach(arg => 
            printjson({ [arg[0] + '_COMP_ATTR_NAME']: 0 })
        )
    }
})

//*********************************************

diogobaltazar

db.system.js.save({
    _id: 'prt'
    , value: (...args) => {
        args.forEach(arg => 
            printjson(arg)          
        )
    }
})

// ******************************************

diogobaltazar

// js NONE

-- haskell
> sum [x | x <- [1..10]]

diogobaltazar

                if ((var as = Item.GetValue(TAXA_FIXA_IRS)) ==  "Sim")
                {

                    SetValueAndVisible(tbcpercentagemirs, PERCENTAGEM_IRS, WebControlType.TableCell);

                }