ThermoDev
/ maketree.js
Created
May 14, 2017 12:58
— forked from mpj/maketree.js
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) |