Replacing the spread operator?

Question

I have the following function.

alias.writeDialogue = function() { return writeDialogue(...arguments); };

I wish to support IE, which doesn't support the spread operator. With what should I replace ...?

isn't it (almost) equivalent to alias.writeDialogue = writeDialogue? — apple apple
– apple apple, Commented Aug 7, 2018 at 4:01
@appleapple I've used that statement earlier on in the programme, so you'd've thought that I'd think to use it now, and that solution, in this case, is exactly what I needed. Thank you for pointing out my idiocy! EDIT: Ah - but will alias.x = x also return what x returns? EDIT: Yes it will. — snazzybouche
– snazzybouche, Commented Aug 7, 2018 at 11:17

CertainPerformance · Accepted Answer · 2018-08-07 03:38:40Z

Use apply to transform an array of arguments into an argument list:

return writeDialogue.apply(undefined, arguments);

But it would be better to integrate Babel into your build process, so that you can write with modern syntax and have it transpiled into ES5-compatible syntax automatically. For example

https://babeljs.io/repl/

Plug in

alias = { writeDialogue: function() { return writeDialogue(...arguments); } }

and you get

"use strict"; alias = { writeDialogue: function (_writeDialogue) { function writeDialogue() { return _writeDialogue.apply(this, arguments); } writeDialogue.toString = function () { return _writeDialogue.toString(); }; return writeDialogue; }(function () { return writeDialogue.apply(undefined, arguments); }) };

Babel will also automatically transpile arrow functions, const and let, async/await (with RegeneratorRuntime), and so on. It's a must-have.

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