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Maketree for recursion episode, more functional and with better time complexity
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const createChildLookupTable = categories => | |
categories.reduce((lookup, child) => | |
Object.assign({}, lookup, { | |
[child.parent]: (lookup[child.parent] || []).concat(child) | |
}), {}) | |
const makeTree = (childLookup, parent) => | |
(childLookup[parent] || []).reduce((node, child) => | |
Object.assign({}, node, { | |
[child.id]: makeTree(childLookup, child.id) | |
}), {}) | |
console.log(makeTree(createChildLookupTable([ | |
{ id: 'animals', parent: 'root' }, | |
{ id: 'dogs', parent: 'animals' }, | |
{ id: 'cats', parent: 'animals' }, | |
{ id: 'chiuaua', parent: 'dogs' }, | |
{ id: 'labrador', parent: 'dogs' }, | |
{ id: 'siamese', parent: 'cats' }, | |
{ id: 'munchkin', parent: 'cats' } | |
]), 'root')) |
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