I want to group an array of objects based on a property which has an array of values,and i want to return a group for each individual value,not only for the whole array.
For example :
let crew = [
{
name:"john",
job :["electrician","carpenter"]
},
{
name: "bill",
job: ["electrician"]
},
{
name: "mark",
job: [ "carpenter"]
}
]
let groupedCrew = _.groupBy(crew,"job")
console.log(groupedCrew)
/*
carpenter:
[
{
job:
[
carpenter
],
name:
"mark"
}
],
electrician:
[
{
job:
[
"electrician"
],
name:
"bill"
}
],
electrician, carpenter:
[
{
job:
[
"electrician",
"carpenter"
],
name:
"john"
}
]
}
*/
In this example i want "john" to also appear in "electrician" group. Any ideas ?
CodePudding user response:
Once again let's group something using reduce
Here's the basic structure (plus the solution)
let crew = [{
name: "john",
job: ["electrician", "carpenter"]
},
{
name: "bill",
job: ["electrician"]
},
{
name: "mark",
job: ["carpenter"]
}
];
var obj = crew.reduce(function(agg, item) {
// grouping logic below this line
item.job.forEach(function(job) {
agg[job] = agg[job] || []
// agg[job].push (item);
// lets push only name so we can see output
agg[job].push(item.name)
})
// grouping logic above this line
return agg
}, {})
console.log(obj)
CodePudding user response:
use custom .reduce() function
there is no need for lodash
const crew = [
{
name: 'john',
job: ['electrician', 'carpenter'],
},
{
name: 'bill',
job: ['electrician'],
},
{
name: 'mark',
job: ['carpenter'],
},
];
const groupedCrew = crew.reduce((groupedCrew, person) => {
person.job.forEach(job => {
if (!groupedCrew[job]) groupedCrew[job] = [];
groupedCrew[job].push(person);
});
return groupedCrew;
}, {});
console.log(JSON.stringify(groupedCrew, null, 4));