How to check if objects inside an array is empty

Question

I have an array of objects which will be send to my database. These objects are fetched from separate Api and some of them come back empty. Hoe do I check if an object within the array is empty and then remove that object.

I tried using a for loop to loop through the array of objects, but this ends up calling the post function several times and sending copies of the array to my database.

Promise.all(promises)
        .then(values => {
for(let i = 0; i<= values.lenght; i++){
    if(Object.keys(values[i]).lenght === 0){
        values.splice(i, 1)
     }else{postArray(values)}}})
        .catch(err => console.log(err))

This posts the array multiple time and still doesn't work.

@RandyCasburn ,yes it was. I didn't copy my code, I just tried to recreate what I tried, I had long deleted that from my code. Its embarrasing — Imhotep
– Imhotep, Commented Feb 24, 2021 at 10:49

Randy Casburn · Accepted Answer · 2021-02-25 00:45:56Z

1

This is a one liner using .filter() along with Object.entries().length removing any object without entries:

values.filter(o=>Object.entries(o).length);

Demo:

const values = [{a:'a',b:'b', c: 'c', d: 'd'},{a:'a',b:undefined, c:undefined, d: 'd'},{a:undefined,b:undefined, c: undefined, d:undefined},{a:'a',b:undefined, c: 'c', d: 'd'},{},{a:undefined,b:undefined, c: undefined, d: undefined},{a:'a',b:'b', c: 'c', d: 'd'},{}];

console.log('Filter out empty objects...');
const result1 = values.filter(o=>Object.entries(o).length);
console.log(result1);

console.log('Filter out objects with no values...');
const result2 = values.filter(o=>Object.values(o).every(v=>v));
console.log(result2);

console.log('Do both filters at once...');
const result3 = values.filter(o=>Object.values(o).every(v=>v) && Object.entries(o).length);
console.log(result3);

edited Feb 25, 2021 at 0:45

answered Feb 24, 2021 at 14:45

Randy Casburn

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4 Comments

Imhotep Over a year ago

Its awesome. Just one more thing pls. If I were to equally eliminate object with keys but empty values. how will I do that? There are 4 key value pairs, some of them come back with 1 or no values at all

Randy Casburn Over a year ago

Something like this: values.filter(o=>Object.values(o).length == Object.keys(o).length) should work. This looks at the number of values and compares it to the number of keys. If they are the same length, there must be a value for every key.

Randy Casburn Over a year ago

Let me look into it.

Randy Casburn Over a year ago

Three results -1. The first thing you asked for, 2. The second thing you asked for in comment 3. both combined.

Mukti Prasad Behera · Accepted Answer · 2021-02-23 16:30:45Z

0

Promise.all(promises).then(values => {
    let postArr = []
    for (let i = 0; i <= values.lenght; i++) {
        if (Object.keys(values[i]).lenght != 0) {
            postArr.push(values[i])
        }
    }
})

You can try this.

postArr will be your final array

answered Feb 23, 2021 at 16:30

Mukti Prasad Behera

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