Count of arrays inside an object!

Question

I have an object with arrays inside, inside that array.. there are other objects! how can I know the total length of all arrays inside the first object! ex:

    let items = { 
        0: [
            { foo: 'foo' },
            { bar: 'bar' },
        ], // length = 2 
        1: [
            { foo: 'foo' },
        ], // length = 1 
    }
    
    let total = 0;
    total += items[0].length;
    total += items[1].length;
    
    console.log(total);

Is there any less verbose way to run this excerpt ? example if I have 50~100 items it is impossible to keep this code

Answer 1

You just need to use a loop that goes through all the properties that exist in the object, and add the associated arrays sizes.

Thus:

let items = { 
    0: [
        { foo: 'foo' },
        { bar: 'bar' },
    ], // length = 2 
    1: [
        { foo: 'foo' },
    ], // length = 1 
}

let total = 0;
for (let prop of Object.keys(items)){ //percorrer todas as propriedades
  total += items[prop].length; //somar o tamanho do array na propriedade corrente
}
    
console.log(total);

I used the function keys of Object that returns an array with all object properties.