/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 vote222 views1 answer
How to check if file exists lua
TypeScript
1 vote351 views1 answer
Ts date get minutes
TypeScript
1 vote202 views1 answer
Can I 'git commit' a file and ignore its content changes?
TypeScript
0 vote181 views1 answer
Porque la ejecución de scripts está deshabilitada en este sistema
TypeScript
0 vote201 views1 answer
How to separate real and imaginary parts of a complex number in python
TypeScript
0 vote207 views1 answer
1,
TypeScript
0 vote199 views1 answer
How to get all dates from range in react js
TypeScript
0 vote205 views1 answer
The softness of a spot lights edge is controlled by penumbra angle, value gives perfect hard edge:
TypeScript
8 votes207 views2 answers
Remove duplicates objects from array angular
TypeScript
0 vote200 views1 answer
On input inset - afetr 5 digits jquery
TypeScript