collaborating with complex structures within an object

Question

collaborating with complex structures within an object

This question may seem simple, but despite my efforts to search through Google and other resources, I can't seem to find the answer.

My array of objects looks like this:

 const myArr = [
     [{
         id: 1,
         price: 200,
     }, {
         id: 2,
         price: 900,
     }, {
         id: 3,
         price: 100,
     }],
     [{
         id: 5,
         price: 100,
     }]
 ];

In simpler terms, I have an array that contains nested arrays, each with objects inside them.

 arr [ [ {},{},{} ] ,   [ {} ]    ]

Now, my goal is to determine two things:

The total count of all products
The sum of prices for all products

(each object counts as one product)

javascript arrays reduce

Answer 1

Answer №1

Merge arrays into a single array using the spread syntax in JavaScript's Array.concat().

Calculate the sum by utilizing Array.reduce().

The length of the flattened array determines the count.

const myArr = [[{"id":1,"price":200},{"id":2,"price":900},{"id":3,"price":100}],[{"id":5,"price":100}]];

const flattened = [].concat(...myArr);
const count = flattened.length;
const sum = flattened.reduce((s, o) => s + o.price, 0);

console.log('count', count);
console.log('sum', sum);

Answer 2

Merge arrays into a single array using the spread syntax in JavaScript's Array.concat().

Calculate the sum by utilizing Array.reduce().

The length of the flattened array determines the count.

const myArr = [[{"id":1,"price":200},{"id":2,"price":900},{"id":3,"price":100}],[{"id":5,"price":100}]];

const flattened = [].concat(...myArr);
const count = flattened.length;
const sum = flattened.reduce((s, o) => s + o.price, 0);

console.log('count', count);
console.log('sum', sum);

Answer 3

Answer №2

You can utilize the spread operator to flatten the array:

var myArr = [
 [
   { 
     id:1,
     price:200,
   },

   { 
     id:2,
     price:900,
   },

   { 
     id:3,
     price:100,
   }
 ],

[
  { 
     id:5,
     price:100,
   }
]
];

var arr = [].concat(...myArr);
console.log('Length: ', arr.length);
var sum = arr.reduce((m, o) => m + o.price, 0);
console.log('Sum: ', sum);

Answer 4

You can utilize the spread operator to flatten the array:

var myArr = [
 [
   { 
     id:1,
     price:200,
   },

   { 
     id:2,
     price:900,
   },

   { 
     id:3,
     price:100,
   }
 ],

[
  { 
     id:5,
     price:100,
   }
]
];

var arr = [].concat(...myArr);
console.log('Length: ', arr.length);
var sum = arr.reduce((m, o) => m + o.price, 0);
console.log('Sum: ', sum);

Answer 5

Answer №3

A clever trick is to use the concat method to combine all objects into a single array.

To determine how many objects are in the array, simply use the length property and then utilize the reduce method to calculate the total sum.

const myArr = [ [ { id:1, price:200, }, { id:2, price:900, }, { id:3, price:100, } ], [ { id:5, price:100, } ] ];

arr = myArr.reduce((acc, arr) => acc.concat(arr), []);
sum = arr.reduce((acc, item) => acc + item.price, 0);
console.log('count ' + arr.length);
console.log('sum ' + sum)

Answer 6

A clever trick is to use the concat method to combine all objects into a single array.

To determine how many objects are in the array, simply use the length property and then utilize the reduce method to calculate the total sum.

const myArr = [ [ { id:1, price:200, }, { id:2, price:900, }, { id:3, price:100, } ], [ { id:5, price:100, } ] ];

arr = myArr.reduce((acc, arr) => acc.concat(arr), []);
sum = arr.reduce((acc, item) => acc + item.price, 0);
console.log('count ' + arr.length);
console.log('sum ' + sum)

Answer 7

Answer №4

Using ES6 to Sum Array Values

If you want to calculate the sum of array values in JavaScript, you can utilize the reduce method.

The reduce method allows you to iterate through an array and add each element value to the sum of previous elements.

Check out this demo:

const myArr = [[{id: 1,price: 200,}, {id: 2,price: 900,}, {id: 3,price: 100,}],[{id: 5,price: 100,}]];
  
let result = myArr.reduce((r,v)=>{
  r.count += v.length;
  r.sum += v.reduce((total,{price}) => total+price,0);
  return r;
},{count:0,sum:0}) 

console.log(result);

.as-console-wrapper {max-height: 100% !important;top: 0;}

Answer 8

Using ES6 to Sum Array Values

If you want to calculate the sum of array values in JavaScript, you can utilize the reduce method.

The reduce method allows you to iterate through an array and add each element value to the sum of previous elements.

Check out this demo:

const myArr = [[{id: 1,price: 200,}, {id: 2,price: 900,}, {id: 3,price: 100,}],[{id: 5,price: 100,}]];
  
let result = myArr.reduce((r,v)=>{
  r.count += v.length;
  r.sum += v.reduce((total,{price}) => total+price,0);
  return r;
},{count:0,sum:0}) 

console.log(result);

.as-console-wrapper {max-height: 100% !important;top: 0;}

collaborating with complex structures within an object

Answer №1

Answer №2

Answer №3

Answer №4

Using ES6 to Sum Array Values

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