I was trying to add large numbers using BigInt and add to sum.

var sum=0; for(let i in ar){ sum += BigInt(ar[i]); } return (sum);

But got an error saying:

sum += BigInt(ar[i]); ^ TypeError: Cannot mix BigInt and other types, use explicit conversions

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## Answer

I tried and came up to answer that we can not mix BigInt to another types. So I converted integer sum into BigInt and then adding it to BigInt. as said in “https://javascript.info/bigint”:

alert(1n + 2); // Error: Cannot mix BigInt and other types

let bigint = 1n; let number = 2;

// number to bigint alert(bigint + BigInt(number)); // 3

// bigint to number alert(Number(bigint) + number); // 3 So my working solution now is:

var sum=0 for(let i in ar) sum = BigInt(sum) + BigInt(ar[i]); return (sum);