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Re: Web midiAPI get name of sending device

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<jonas.thornvall@gmail.com> wrote on 13 Mar 2020 in comp.lang.javascript: 
> So in your line above data, timeStamp, target are reserved words 
> or created vars for holding the "three attributes?

let {data, timeStamp, target} = midiMessageEvent,

is an equivalent of:

let timeStamp = midiMessageEvent.timeStamp;
let data = midiMessageEvent.data;
let target = midiMessageEvent.target;

=====================================

let ascii = {
    a: 97,
    b: 98,
    c: 99
};

let {a, b, c} = ascii;

a // returns: 97

var {c, a, b} = ascii;

// 'var' above required,as:
// let {c, a, b} = ascii;
// would give error: "Identifier 'c' has already been declared"
// {c, a, b} = ascii;
// would give error: "Uncaught SyntaxError: Unexpected token '='"

a // returns: 97

var {c, a, e} = ascii;

e // returns: undefined

let {c: qq, a: ww, b: ee} = ascii;

ww // returns: 97
qq // returns: 99

-- 
Evertjan.
The Netherlands.
(Please change the x'es to dots in my emailaddress)

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Thread

Web midiAPI get name of sending device Jonas Thörnvall <jonas.thornvall@gmail.com> - 2020-03-10 00:39 -0700
  Re: Web midiAPI get name of sending device Jonas Thörnvall <jonas.thornvall@gmail.com> - 2020-03-10 00:41 -0700
  Re: Web midiAPI get name of sending device "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2020-03-10 15:21 -0700
    Re: Web midiAPI get name of sending device "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2020-03-10 15:43 -0700
      Re: Web midiAPI get name of sending device "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2020-03-10 17:15 -0700
        Re: Web midiAPI get name of sending device Jonas Thörnvall <jonas.thornvall@gmail.com> - 2020-03-11 14:32 -0700
          Re: Web midiAPI get name of sending device "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2020-03-11 15:52 -0700
            Re: Web midiAPI get name of sending device Jonas Thörnvall <jonas.thornvall@gmail.com> - 2020-03-12 05:04 -0700
            Re: Web midiAPI get name of sending device Jonas Thörnvall <jonas.thornvall@gmail.com> - 2020-03-12 05:21 -0700
            Re: Web midiAPI get name of sending device Jonas Thörnvall <jonas.thornvall@gmail.com> - 2020-03-12 05:30 -0700
              Re: Web midiAPI get name of sending device Jonas Thörnvall <jonas.thornvall@gmail.com> - 2020-03-12 06:32 -0700
              Re: Web midiAPI get name of sending device "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2020-03-12 12:16 -0700
                Re: Web midiAPI get name of sending device Jonas Thörnvall <jonas.thornvall@gmail.com> - 2020-03-12 12:55 -0700
                Re: Web midiAPI get name of sending device "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2020-03-12 21:11 -0700
                Re: Web midiAPI get name of sending device Jonas Thörnvall <jonas.thornvall@gmail.com> - 2020-03-13 02:16 -0700
                Re: Web midiAPI get name of sending device "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2020-03-13 13:27 +0100
                Re: Web midiAPI get name of sending device "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2020-03-13 13:34 +0100
                Re: Web midiAPI get name of sending device "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2020-03-13 12:47 -0700
    Re: Web midiAPI get name of sending device Jonas Thörnvall <jonas.thornvall@gmail.com> - 2020-03-11 03:35 -0700
      Re: Web midiAPI get name of sending device Jonas Thörnvall <jonas.thornvall@gmail.com> - 2020-03-11 03:44 -0700
        Re: Web midiAPI get name of sending device "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2020-03-11 05:21 -0700

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