有没有类似的方法来创建没有原型的数组？

Question

Is there something analogous to Object.create(null) , where the object has no prototype, for an Array ?

var someArray = [];
someArray.__proto__ = null;

Answer 1

No, there is no such thing like Array.create that creates arrays without a prototype. However, __proto__ is despised (it's legacy only), the proper way would be

var someWeirdArray = Object.setPrototypeOf([], null);

which also has the advantage of being a single expression.

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And just a word of caution (that you hopefully don't need): Don't do this! There's no good reason.

Answer 2

I know this is old, but for future viewers, if you want to have an array without the weight associated with the prototype, just use Object.create(null) and key it with numbers.

const myEmptyObj = Object.create(null)

myEmptyObj[0] = 'someStuff'
myEmptyObj[1] = 'someOtherStuff'

you might even be able to convince array methods to work on it. I haven't tried this but:

const arrMap = (fn, arr) => Array.prototype.map.call(arr, fn)

where arr is the object in question and fn is your map function...