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camskene/group-by-tag.js

Created August 30, 2019 16:16
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group-by-tag.js
let arr = [
{
title: 'Cat',
tags: ['tag1', 'tag2'],
},
{
title: 'Dog',
tags: ['tag1', 'tag2'],
},
{
title: 'Monkey',
tags: ['tag1'],
},
{
title: 'Squirrel',
tags: ['tag1'],
},
]
let groupedByTag = arr.reduce((acc, node) => {
node.tags.forEach((tag) => {
if (Array.isArray(acc[tag])) {
acc[tag].push(node);
} else {
acc[tag] = [node];
}
});
return acc;
}, {});
console.log(JSON.stringify(groupedByTag, null, 2));
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