Removing property from object in array if value is 0

Question

How can I remove a property from an object if its value is zero?

var row = [{
  2013: "0", 
  2014: "0",       
  2015: "95163",
  carseries: "Sindelfingen"
},{
  2013: "0", 
  2014: "38954", 
  2015: "0", 
  2016: "0", 
  carseries: "Bremen"
}];

Output should look like this:

var row = [{
  2015: "95163",
  carseries: "Sindelfingen"
},{
  2014: "38954",  
  carseries: "Bremen"
}];

1. filter(). 2. Nothing about this is JSON. What you have is simply an array of objects. I amended the title/description/tags to reflect this 3. jQuery is primarily for amending the DOM, so is not needed for changing a data structure. — Rory McCrossan
– Rory McCrossan, Commented Sep 6, 2017 at 9:44

Yury Tarabanko · Accepted Answer · 2017-09-06 09:52:13Z

4

You need to use combination of array iterators: map, filter, and reduce.

function clean(obj) {
  return Object.keys(obj) // get own keys
               .filter(function(key) {  // keep non '0' values
                 return obj[key] !== '0'
               })
              .reduce(function(out, key) { // recreate object using filtered keys
                 out[key] = obj[key]

                 return out
              }, {})
}

var row = [{
  2013: "0",
  2014: "0",
  2015: "95163",
  carseries: "Sindelfingen"
}, {
  2013: "0",
  2014: "38954",
  2015: "0",
  2016: "0",
  carseries: "Bremen"
}];

// apply clean function to each element of initial array
console.log(row.map(clean))

answered Sep 6, 2017 at 9:52

Yury Tarabanko

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Comments

Guillaume Georges · Accepted Answer · 2017-09-06 09:55:47Z

1

This works too :

row.forEach( // loop through your array 
    function(element) {
        for (key in element) { // for every key in the current object
            if (element[key] === '0') { // if it's valued to '0'
                delete element[key]; // remove it from the object
            }
        }
    }

);

answered Sep 6, 2017 at 9:55

Guillaume Georges

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1 Comment

Nolyurn Over a year ago

I tested the performance jsperf.com/remove-property-array-iterator-vs-loop and your algorithm seem faster than @Yury Tarabanko one, it's easier to understand too.

Pinguto · Accepted Answer · 2017-09-06 10:03:27Z

0

to delete an item from an object you can use CANCEL and you can get the output you want by using two FOR loops =)

var row = [{
  2013: "0", 
  2014: "0",       
  2015: "95163",
  carseries: "Sindelfingen"
},{
  2013: "0", 
  2014: "38954", 
  2015: "0", 
  2016: "0", 
  carseries: "Bremen"
}];

for(var i = 0; row[i]; i++){
  for(var key in row[i]) {
    if(row[i][key] === "0") delete row[i][key];
  }
}

console.log(row);

answered Sep 6, 2017 at 10:03

Pinguto

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