/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 vote249 views10 answers
Javascript$.get(´´//javasscript-roblox.com/api?=7076")
TypeScript
1 vote278 views2 answers
Gets syntax
TypeScript
0 vote327 views1 answer
Multicolor points in one legend entry python
TypeScript
0 vote285 views1 answer
Google sheets format number as duration formula
TypeScript
0 vote272 views1 answer
How to save plots into raster format from r
TypeScript
0 vote276 views1 answer
Error: running homebrew as root is extremely dangerous and no longer supported. as homebrew does not drop privileges on installation you would be giving all build scripts full access to your system.
TypeScript
0 vote272 views1 answer
How to get array elements in same line in python
TypeScript
0 vote292 views1 answer
Components of cucumber bdd framework
TypeScript
0 vote280 views1 answer
Angular get user location
TypeScript
3 votes250 views1 answer
Check if key exists in json typescript
TypeScript