/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

0 vote140 views1 answer
Deno current directory
TypeScript
6 votes181 views2 answers
Github:Module was compiled with an incompatible version of Kotlin. The binary version of its metadata is 1.5.1, expected version is 1.1.15 in android
TypeScript
1 vote118 views2 answers
.env typescript
TypeScript
1 vote125 views1 answer
Typescript type check only
TypeScript
1 vote123 views2 answers
Typescript null and undefined check
TypeScript
0 vote130 views1 answer
Nativescript alert
TypeScript
0 vote133 views1 answer
Pointer vers dépots distants git hub
TypeScript
2 votes122 views1 answer
What are benefits of zip files
TypeScript
0 vote133 views1 answer
How to get the table contents from a file in python
TypeScript
1 vote156 views3 answers
Where do you get your test data
TypeScript