/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 vote203 views1 answer
Difference in minutes between 2 time inputs laravel
TypeScript
0 vote199 views1 answer
Google sheets mode text
TypeScript
0 vote189 views1 answer
Is missing in props validation typescript
TypeScript
0 vote200 views1 answer
How to take multiple int inputs in the same line in C++
TypeScript
0 vote245 views1 answer
Which electromagnetic radiation is used for heating and night vision equipment
TypeScript
-1 vote211 views2 answers
Typescript initialize object
TypeScript
0 vote195 views1 answer
How to setup netflix workflow worker
TypeScript
0 vote237 views1 answer
Typescript reduce initial value type
TypeScript
32 votes216 views6 answers
Bootstrap alerts
TypeScript
0 vote200 views1 answer
How to gray out the unused imports in vscode
TypeScript