Lodash find and keep index of items in an array

Question

I am trying to find, group and keep indices of keywords in an array and store it as an object.

So say I have an object like so:

{
  "foo": ["bar", "bazz"],
  "boo": ["far", "fuzz"]
}

And I have a sentence like so:

Lorem ipsum dolor sit bar, consectetur adipiscing bazz. Nam luctus fringilla bazz. Suspendisse mauris far, aliquam in far nec, placerat quis leo. fuzz fuzz,

I wanted an output like so:

{
  "foo": [
    {"bar": [22]},
    {"bazz": [50, 77]}
  ],
  "boo": [
    {"far": [102, 118]},
    {"fuzz": [146, 151]}
  ]
}

I am trying to highlight the text as well as keep it categorized.

Answer 1

If you want to find indexes, you can use the following code

const a =
  "Lorem ipsum dolor sit bar, consectetur adipiscing bazz. Nam luctus fringilla bazz. Suspendisse mauris far, aliquam in far nec, placerat quis leo. fuzz fuzz,";

const b = {
  foo: ["bar", "bazz"],
  boo: ["far", "fuzz"]
};

function groupAndFindIndexes(text, groups) {
  return Object.keys(b).reduce((store, id) => {
    store[id] = b[id].map(word => {
      const reg = new RegExp(word, "g");
      const items = [];
      let find = reg.exec(a);
      while (find) {
        items.push(find.index);
        find = reg.exec(a);
      }
      return { [word]: items };
    });
    return store;
  }, {});
}

const result = groupAndFindIndexes(a, b);

Result is:

{
  "foo": [
    {
      "bar": [22]
    },
    {
      "bazz": [50, 77]
    }
  ],
  "boo": [
    {
      "far": [102, 118]
    },
    {
      "fuzz": [146, 151]
    }
  ]
}