manipulate array of hashes using javascript

Question

Can you please show me the best way to process/ manipulate this array of hashes using javascript function chaining. I want to filter the data and return ONLY an array of hashes that contains data that in NOT all 0’s. 

data = [
    {name: "apple", data: [0, 0, 0]},
    {name: "banana", data: [1, 0, 2]},
    {name: "carrot", data: [0, 0, 0]},
    {name: "pineapple", data: [0, 0, 3]},
]

//result after filtering

data = [
    {name: "banana", data: [1, 0, 2]},
    {name: "pineapple", data: [0, 0, 3]},
]

I was thinking something along the lines of

data.filter((hash,i) => {hash.data.every((elem,i)=> elem == 0);

I was thinking something along the lines of data.filter((hash,i) => {hash.data.every((elem,i)=> elem == 0); return hash } ) but this doesn’t work and I would like some guidance. Thank you again! — Nat
– Nat, Commented Aug 2, 2019 at 23:28
Don't use curly quotes in JavaScript code, use ASCII quotes. — Barmar
– Barmar, Commented Aug 2, 2019 at 23:31
Use .filter and use the every or some method in the filtering function. — Barmar
– Barmar, Commented Aug 2, 2019 at 23:33
Why does the third element have a carrot property instead of data? Is that supposed to be the name? — Barmar
– Barmar, Commented Aug 2, 2019 at 23:37

Gabriele Petrioli · Accepted Answer · 2019-08-03 10:43:51Z

1

This should do it

const data = [{name:”apple”,data:[0,0,0]}, {name:”banana”,data:[1,0,2]}, {name:””,carrot:[0,0,0]}, {name:”pineapple”,data:[0,0,3]}, ]

const nonzero = data.filter(({data}) => data.some(Boolean));

edited Aug 3, 2019 at 10:43

answered Aug 2, 2019 at 23:37

Gabriele Petrioli

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Comments

Barmar · Accepted Answer · 2019-08-02 23:38:10Z

0

You were almost right. You need to invert the result of the every test, since you want the elements that aren't all zero; you could also use some and test for non-zero. Also, don't put curly braces around the body of the function if you just want to return the result of the expression.

data = [{
    name: "apple",
    data: [0, 0, 0]
  },
  {
    name: "banana",
    data: [1, 0, 2]
  },
  {
    name: "carrot",
    data: [0, 0, 0]
  },
  {
    name: "pineapple",
    data: [0, 0, 3]
  },
];
console.log(data.filter(hash => !hash.data.every(elem => elem == 0)));

answered Aug 2, 2019 at 23:38

Barmar

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