How to convert an array of objects to an array from classes?

Question

How to convert an array of objects to an array from classes? without a loop?

https://repl.it/repls/YellowSuperficialHexagons

export class Lead {
public value =  'val';

public constructor(      init?: Partial<Lead>      ) {
    Object.assign(this, init);
}

public printOk(){
  return this.value + ' ok';
}
}

let arr = [ {'value': '1'}, {'value': '2'} ]

let lead: Lead = new Lead(arr[0]);
console.log(lead.printOk());

const leads:Partial<Lead>[] = arr;

console.log(leads[0].value);

//console.log(leads[0].printOk()); //error

Nicholas Tower · Accepted Answer · 2019-10-26 05:06:51Z

3

One way or another, you'll need to call new Lead for each element of arr. Simplest way to do this would probably be with array.map:

let arr = [ {'value': '1'}, {'value': '2'} ];
const leads: Lead[] = arr.map(init => new Lead(init));

answered Oct 26, 2019 at 5:06

Nicholas Tower

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