TypeScript: How to make object from array of tuple?

Question

I have following array of tuple, need to make an object from, how?

Object.keys(invoiceItems)?.map(function (key, item) {
  [key, 1];
}

I know in Swift Dictionary(uniqueKeysWithValues: method call I need, what about in Typescript?

Does JavaScript actually have tuples (outside of this TC39 proposal)? — jarmod
– jarmod, Commented Sep 8, 2021 at 17:43
@jarmod Not exactly, but TypeScript does have a type signature for tuples that differs from arrays (though in execution, they behave the same). — Connor Low
– Connor Low, Commented Sep 8, 2021 at 17:44
@jarmod you have used 'let aa = Object.keys(invoiceItems).forEach((key)....' which will return undefined, try using the same with map!! — Wasit Shafi
– Wasit Shafi, Commented Sep 8, 2021 at 18:48
@WasitShafi no idea what you're referring to here. Nobody used forEach in this post. — jarmod
– jarmod, Commented Sep 8, 2021 at 18:53

Parzh · Accepted Answer · 2021-09-08 17:49:04Z

3

Assuming that by tuples you mean two-element arrays, you can use Object.fromEntries to create such object:

const entries = [
  [ "value1", 42 ],
  [ "value2", 17 ],
  [ "value3", 51 ],
];

const object = Object.fromEntries(entries);

console.log(object);

answered Sep 8, 2021 at 17:49

Parzh

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1 Comment

János Over a year ago

still a problem, would you check? stackoverflow.com/questions/69108183/…

Wasit Shafi · Accepted Answer · 2021-09-08 19:23:11Z

0

Here I assume your invoice items with some dummy data, below are 2 ways to create object with key:value

const invoiceItems = [[101, 'Coffee'], [102, 'Tea'], [103, 'Book']]

// Method 1
const o =  Object.fromEntries(invoiceItems);
console.log('o :', o)


// Method 2
const o2 = {}
Object.keys(invoiceItems).forEach(i => o2[invoiceItems[i][0]] = invoiceItems[i][1])
console.log('o2 :', o2)

answered Sep 8, 2021 at 19:23

Wasit Shafi

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