I want to do a grouping for JavaScript object as age.My JSON is
var jsonObj=[{"name":"john","age":23},{"name":"mark","age":25},{"name":"jeni","age":21}]`
I want to be the group result like here.
[23:{"name":"john","age":23},25:{"name":"mark","age":25},21:{"name":"jeni","age":21}]
Please help me to get a result, I try with map and filter but did not get the result.
Use Array#reduce to group the objects. Because there can multiple people with the same age, collect them into an array under the age property:
var jsonObj=[{"name":"john","age":23},{"name":"mark","age":25},{"name":"poll","age":23},{"name":"jeni","age":21}];
var result = jsonObj.reduce(function(r, o) {
r[o.age] || (r[o.age] = []); // if the age key doesn't exist, set it to be an array
r[o.age].push(o); // push the object into the array
return r;
}, {});
console.log(result);Or the fancy ES6 one liner version:
var jsonObj=[{"name":"john","age":23},{"name":"mark","age":25},{"name":"poll","age":23},{"name":"jeni","age":21}];
var result = jsonObj.reduce((r, o) => ((r[o.age] || (r[o.age] = [])).push(o), r), {});
console.log(result);You could take the hash table as result. Then loop and create new arrays for new keys. Later push the object.
var data = [{ name: "john", age: 23 }, { name: "mark", age: 25 }, { name: "poll", age: 23 }, { name: "jeni", age: 21 }],
result = {};
data.forEach(o => (result[o.age] = result[o.age] || []).push(o));
console.log(result);.as-console-wrapper { max-height: 100% !important; top: 0; }You can use underscore js to solve this problem.
Add underscore js first<script src='https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore.js' ></script>
then you can simply get the result.
var result=_.indexBy(jsonObj, 'age');
_.groupBy(jsonObj, 'age')You can try it :
var jsonObj = [{ "name": "john", "age": 23 }, { "name": "mark", "age": 25 }, { "name": "poll", "age": 23 }, { "name": "jeni", "age": 21 }];
let result = {};
jsonObj.forEach(item => {
if(result.hasOwnProperty(item.age)) {
let arr = [];
if(Array.isArray(result[item.age])) {
result[item.age].push(item);
} else {
result[item.age] = [result[item.age], item];
}
} else {
result[item.age] = item;
}
});
console.log(result)
jsonObj two object has same ages it should come as array