set-array/build/src/group.js

Set array items declaratively

export const groupBy=(array,propName)=>{
const groups={};


for(const object of array){
addGroup(object,groups,propName)
}

return groups
};


const addGroup=(object,groups,propName)=>{
const group=String(object[propName]);

if(groups[group]===undefined){

groups[group]=[object]
}else{

groups[group].push(object)
}
};