// first parameter is the Accumulator and 2nd is the current value
let result = [1, 2, 3, 4].reduce(function (a, b) {
//console.log(a, b)
return a + b;
});
result
// get total of the all items
let products = [
{ name: "Cucumber", type: "vegetable", price: 45.0 },
{ name: "Banana", type: "fruit", price: 20.0 },
{ name: "Carrot", type: "vegetable", price: 20.0 },
{ name: "Apple", type: "fruit", price: 75.0 }
];
let total = products.reduce((total, product) => {
return total + product.price
}, 0)
total
// create a dictionary of the products by name
let lookup = products.reduce((dictionary, product) => {
dictionary[product.name] = product; // fixed the syntax error
return dictionary;
}, {});
console.log(lookup["Banana"].type) // lookup["Banana"].price
let people = [
{ name: "Jane", age: 34 },
{ name: "Mark", age: 20 },
{ name: "Abby", age: 20 },
]
// group by age
let groupedByAge = people.reduce((dictionary, person) => {
dictionary[person.age] = dictionary[person.age] || []; // fixed the syntax error
dictionary[person.age].push(person);
return dictionary;
}, {});
groupedByAge
// Extra parameters
let test = [1, 2, 3, 4].reduce(function (accumulator, item, index, array) {
console.log(index)
console.log(array)
return accumulator + item;
}, 0);
