Find the sum of elements in a given array.

The function is defined using the?const?keyword, assigning an arrow function to the constant. This function also takes an array of numbers and returns the sum. The?reduce?method is a built-in method for arrays that allows you to accumulate a single value from all elements.

The?reduce?method in JavaScript uses a callback function as an argument. This callback function takes two parameters:?accumulator?and?current. The?accumulator?is a variable that holds the accumulated value during the array iteration and is initially set to 0. The?current?parameter represents the current element being processed in the array.

Inside the callback function, the?current?value is added to the?accumulator. The?reduce?method automatically executes the callback for each element in the array, accumulating the sum in the?accumulator. Finally, it outputs the total accumulated value, representing the sum of all elements in the array.

const sumUsingReduce = (numberArray: number[]): number => {
  return numberArray.reduce((sum, currentItem) => sum + currentItem, 0);
}
const numbers = [1, 2, 3, 4, 5];
const total = sumUsingReduce(numbers);        

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