/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 vote241 views1 answer
Open url with pacage.json
TypeScript
0 vote237 views1 answer
Mac mini late 2010
TypeScript
0 vote235 views1 answer
Ts number addition is concatenating like strings
TypeScript
0 vote238 views1 answer
Requirements check failed for jdk 8 (
TypeScript
12 votes251 views4 answers
Google fonts poppins
TypeScript
0 vote225 views1 answer
How to send data between components in react using link
TypeScript
0 vote243 views1 answer
Disable button typescript
TypeScript
0 vote255 views1 answer
Check if that inex exisits array c#
TypeScript
8 votes228 views5 answers
Google fonts cdn link
TypeScript
18 votes318 views3 answers
ReferenceError: fetch is not defined
TypeScript