/TypeScript/Angular typescript filter array group by attribute

Angular typescript filter array group by attribute

function groupBy(list, keyGetter) {
    const map = new Map();
    list.forEach((item) => {
         const key = keyGetter(item);
         const collection = map.get(key);
         if (!collection) {
             map.set(key, [item]);
         } else {
             collection.push(item);
         }
    });
    return map;
}

// example usage

const pets = [
    {type:"Dog", name:"Spot"},
    {type:"Cat", name:"Tiger"},
    {type:"Dog", name:"Rover"}, 
    {type:"Cat", name:"Leo"}
];
    
const grouped = groupBy(pets, pet => pet.type);
    
console.log(grouped.get("Dog")); // -> [{type:"Dog", name:"Spot"}, {type:"Dog", name:"Rover"}]
console.log(grouped.get("Cat")); // -> [{type:"Cat", name:"Tiger"}, {type:"Cat", name:"Leo"}]

Source: stackoverflow.com

Similar codes

2 votes189 views2 answers
GetServersideprops in nextjs
TypeScript
0 vote196 views1 answer
Explode() expects parameter 2 to be string, array given
TypeScript
0 vote193 views1 answer
Are remote objects and distributed objects the same
TypeScript
2 votes179 views2 answers
File_check.ps1 cannot be loaded because running scripts is disabled on this system.
TypeScript
0 vote143 views1 answer
Lists - Learn C#
TypeScript
7 votes236 views2 answers
Arrow function in ts
TypeScript
4 votes208 views1 answer
Enumerate multiple lists python
TypeScript
4 votes288 views10 answers
Roblox
TypeScript
12 votes205 views1 answer
How check is file exist linux
TypeScript
3 votes182 views1 answer
Rospy create package
TypeScript