HackerRank Problem solving in JavaScript (Simple Array Sum !)

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[Dhirajkumar-fbto]

anyone please help : is we also need to write Constrain condition in the solution

[adityamarzuk]

function simpleArraySum(ar) {
let sum = ar.reduce(myFunction);

function myFunction(total, value) {
return total + value;
}
return sum
}