Referencing 'this' to an array

Asked Apr 09 '20 at 12:48

Active Apr 09 '20 at 12:50

Viewed 24 times

I had this wild thought of adding a method to an array - i just don't know if this is possible. I'll forever be indebted to some knowledge you might share :)

const arr = [1,2,3,4];
arr.hello = () => {return this};
console.log(arr['hello']()); //outputs an empty object {}

If [arr] is ultimately an object, wouldn't this refer to [arr]?
At the end of the day, I just wanted to get arr[0] via this

edited Apr 09 '20 at 12:50

isherwood

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asked Apr 09 '20 at 12:48

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arrow functions have a lexical `this` – Mulan Apr 09 '20 at 12:51
Array elements can't be addressed by key as they have no key. – isherwood Apr 09 '20 at 12:51
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"I had this wild thought of adding a method to an array" just don't. Make it a function accepting array as the first argument. – Yury Tarabanko Apr 09 '20 at 12:51
Also you can't use `arrow` functions as methods. It captures context [lexically](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/Arrow_functions). – Yury Tarabanko Apr 09 '20 at 12:53
Related: [adding custom functions into Array.prototype](https://stackoverflow.com/q/948358) – VLAZ Apr 09 '20 at 13:09
thanks masters! I finally understood what went wrong. What a great help!! :)) – Apr 09 '20 at 13:20

Referencing 'this' to an array

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