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You can use array#reduce to accumulate value corresponding to each key in an object.

let myfile = [{"name":"John","eid":664,"socialid":399,"testid":799}, {"name":"Sam","testid":249,"eid":64,"socialid":80}, {"name":"Albert","eid":422,"testid":20,"socialid":10}, {"name":"Michel","eid":497,"testid":15,"socialid":60}],
    result = myfile.reduce((r,o) => {
      Object.entries(o).forEach(([key,value]) => {
        r[key] = r[key] || [];
        r[key].push(value);
      });
      return r;
    },{});
console.log(result);

Filtering json object - JavaScript, I imagine you could create a function, and pass tests to in an array so it could be dynamic - it would filter for things that passed every test. That  Return an array of all the values in the ages array that are 18 or over: var ages = [32, 33, 16, 40]; function checkAdult (age) {. return age >= 18; } function myFunction () {. document.getElementById("demo").innerHTML = ages.filter(checkAdult); }


You can reduce the array into one object:

let myfile = [
    { name: 'John', eid: 664, socialid: 399, testid: 799 },
    { name: 'Sam', testid: 249, eid: 64, socialid: 80 },
    { name: 'Albert', eid: 422, testid: 20, socialid: 10 },
    { name: 'Michel', eid: 497, testid: 15, socialid: 60 },
];

console.log(
    myfile.reduce(
        (result, item) =>
            Object.entries(item).reduce((result, [key, value]) => {
                result[key] = result[key] || [];
                result[key].push(value);
                return result;
            }, result),
        {},
    ),
);

Array.prototype.filter(), Array filter? Array map? Array reduce? None of these? I was looping the objects and setting the visible property of the object to either true or false. filter () calls a provided callback function once for each element in an array, and constructs a new array of all the values for which callback returns a value that coerces to true. callback is invoked only for indexes of the array which have assigned values; it is not invoked for indexes which have been deleted or which have never been assigned values.


You main problem is, you try to access publication which does not exist in the inner objects.

For an inline renaming, you could take an object with the given name as key and the new name as value and take the actual key as default value. Then create a new array, if not exists and push the value to it.

Finally, you get an object with wanted keys with all value from the given data.

var myfile = [{ "name": "John", "eid": 664, "socialid": 399, "testid": 799 }, { "name": "Sam", "testid": 249, "eid": 64, "socialid": 80 }, { "name": "Albert", "eid": 422, "testid": 20, "socialid": 10 }, { "name": "Michel", "eid": 497, "testid": 15, "socialid": 60 }],
    replace = { name: 'publication' },
    result = myfile.reduce((r, o) => Object.entries(o).reduce((p, [k, v]) => {
        k = replace[k] || k;
        (p[k] = p[k] || []).push(v);        
        return p;
    }, r), Object.create(null));

console.log(result);
.as-console-wrapper { max-height: 100% !important; top: 0; }

Filtering an array of JSON objects by multiple properties : javascript, I am attempting to filter JSON into an array of arrays containing a property value based on the product. The form is as follows: [{ "product":  JSON.stringify has an optional second argument: a replacer or filter that can be a function or an array. If it is an array, it specifies by name which entries to include in the stringify result. If it is a function, it can be used to eliminate entries or change their values.


Like this?

let json=[
    {"name":"John","eid":664,"socialid":399,"testid":799},
    {"name":"Sam","testid":249,"eid":64,"socialid":80},
    {"name":"Albert","eid":422,"testid":20,"socialid":10},
    {"name":"Michel","eid":497,"testid":15,"socialid":60}
]
let output={
  publication:[],
  eid:[],
  testid:[],
  socialid:[]
}
for(let i in json){
    output.publication.push(json[i].name)
    output.eid.push(json[i].eid)
    output.testid.push(json[i].testid)
    output.socialid.push(json[i].socialid)
}
console.log(output)

How to filtering JSON by object property value, You are basically making your object filtering into an 0(m∗n) complexity function ( where m is number of type id's) that your are filtering against  First generate the schema using the data you provided: Get the array contained inside, array name is 1394443, and then use Apply to each to traverse the array elements to get the element with deductionCategoryId equal to 123 or 124.


Filtering JSON objects from array of values, Example. Return an array of all the values in the ages array that are 18 or over: var ages = [32, 33, 16, 40]; function checkAdult(age) { return age >= 18; } function​  Hi @v-xida-msft . As always, thanks for the info. Just one question. Above you mention "In addition, if you want to access the specific item whose question ID is euqal to 1, please take a try with the following workaround:" and then specify the the following expression


JavaScript Array filter() Method, How do you filter an array of objects in typescript? by Alex Permyakov. How to simplify your codebase with map(), reduce(), and filter() in JavaScript Photo by Anders Jildén on Unsplash. When you read about Array.reduce and how cool it is, the first and sometimes the only example you find is the sum of numbers.


filter() Array Method in JavaScript ← Alligator.io, Here's my data, it's OK if you convert it into an array and work on it, json. Hide Expand Copy Code. [ { "title": "Real-world evidence of high-cost  This term refers to the transformation of data into a series of bytes (hence serial) to be stored or transmitted across a network. To handle the data flow in a file, the JSON library in Python uses dump() function to convert the Python objects into their respective JSON object, so it makes easy to write data to files. See the following table