Remove a property from an object contained in an array

Question

I have a variable array:

Bola = [];

I added the properties to it:

Bola[0] = { peso:0.5, cor:"branca", marca:"nike", nota:8 };
Bola[1] = { peso:0.7, cor:"verde", marca:"adidas", nota:9  };

I would like to remove the properties "brand" and "weight". How do I do this?

Answer 1

You can use the delete to remove properties of objects within the array (which is what you have, two objects within the array bola.

// Não esqueça o var!
var bola = [];
bola[0] = { peso:0.5, cor:"branca", marca:"nike", nota:8 };
bola[1] = { peso:0.7, cor:"verde", marca:"adidas", nota:9  };

for(var i=0; i<bola.length; i++) {
    delete bola[i].marca;
    delete bola[i].peso;
}
document.body.innerHTML = JSON.stringify(bola);

Note: use lowercase to name variables, leave uppercase initials for "classes" (constructor functions).

Answer 2

There is currently a better way to do this!

// Para arrays usa palavra no plural!
const bolas = [];
bolas[0] = { peso:0.5, cor:"branca", marca:"nike", nota:8 };
bolas[1] = { peso:0.7, cor:"verde", marca:"adidas", nota:9  };

const novasBolas = bolas.map(bola => ({
  peso: bola.peso,
  cor: bola.cor
})

In the above example, this map function is similar to the foreach, but it returns a new array.

1. For each element I do an operation.
2. In the operation I make an implicit return of an object.
3. In the return object I pass only the values I want to use.