/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

1 vote286 views1 answer
Ion modal dismiss
TypeScript
0 vote288 views1 answer
Get list of property values from list of objects swift
TypeScript
0 vote303 views1 answer
Wordpress number of posts by user
TypeScript
0 vote277 views1 answer
Reading multiple objects from file in java
TypeScript
3 votes311 views6 answers
Get multiple inputs in python
TypeScript
4 votes271 views1 answer
Property 'value' does not exist on type 'HTMLElement'.
TypeScript
0 vote299 views1 answer
Pick<Pick<Pick<DetailedHTMLProps<HTMLAttributes<HTMLDivElement>, HTMLDivElement>
TypeScript
0 vote288 views1 answer
Ggplots in r
TypeScript
1 vote321 views3 answers
Check null typescript
TypeScript
1 vote311 views2 answers
Show all posts from category
TypeScript