Simple ES6 reduce sample

readme.md

reduce

Reduce allows us calculate a total, applying an operation on every operation of an array.

This can save us lot of "for" loops (enhannce readibility).

steps

Let's implement a function that will sum up an array.

Usually we would do something like:

const sales = [20, 30 ,25];


function totalSales(sales) {
  let totalSales = 0;

  for(let i=0;i< sales.length;i++) {
    totalSales += sales[i];
  }
  
  return totalSales;
}

console.log(totalSales(sales));

By Using reduce:

const sales = [20, 30 ,25];

function totalSales(sales) {
  return sales.reduce((total, sale) => total += sale)
}

console.log(totalSales(sales));