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Rooted by: Restructure object tree
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  • Code 
    export function transform(source: any) {
    const target = {};
    Object.entries(source).forEach(function ([k, v]) {
        k.split("_").slice(0, -1).reduce(function (node: {[key: string]: any}, element: string) {
            return node[element] ??= {};
        }, target)[k.slice(k.lastIndexOf("_") + 1)] = v;
    });
    return target;
}
     Test Cases 
    // See https://www.chaijs.com for how to use Chai.
import { assert } from "chai";

import { transform } from "./solution";

// TODO Add your tests here
describe("example", function() {
  const before = { a_b_c : 'value' }
    const before_2 = { a_b_c : 'value', d:'value_d' }
const after = { 
a : { 
  b: { 
    c: 'value'
    }
  }
}
const after_2 = { 
a : { 
  b: { 
    c: 'value'
    }
  },
d:'value_d'
}
  it("test", function() {
    assert.deepEqual(transform(before), after);
     assert.deepEqual(transform(before_2), after_2);
  });
});
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  • Code
    • export function transform(obj: any) {
    • const _RegEx = new RegExp(/_/);
    • const underscoredProp = Object.keys(obj).find(key =>
    • _RegEx.test(key)) || '';
    • const value = obj[underscoredProp];
    • const propertList = underscoredProp.split('_').reverse();
    • let toAdd = {};
    • propertList.map((prop,index) => {
    • toAdd = index==0 ?{[prop]:value} : {[prop]:toAdd}
    • })
    • return toAdd;
    • export function transform(source: any) {
    • const target = {};
    • Object.entries(source).forEach(function ([k, v]) {
    • k.split("_").slice(0, -1).reduce(function (node: {[key: string]: any}, element: string) {
    • return node[element] ??= {};
    • }, target)[k.slice(k.lastIndexOf("_") + 1)] = v;
    • });
    • return target;
    • }