JavaScript Read data from multidimensional object with dynamic keys [duplicate]

Question

Background

I have an object like below:

// Data from the database according to their columns and subordinate tables.
const itemData = {
    'license_number': '25/2022',
    'application': {
        'tracking_number': '535345345',
        'applicant_name': 'Misir Ali Humayun'
    }
};

I know I can read the data from this object like below:

console.log(itemData.licese_number); // '25/2022'
console.log(itemData.application.tracking_number); // '535345345'

// or

console.log(itemData["licese_number"]); // '25/2022'
console.log(itemData.["application"]["tracking_number"]); // '535345345'

Actual Issue

I want to read the data in a dynamic fashion. For example, I have a defined structure like below:

var placeholder = [
    {
        "find": "%LICENSE%",
        "column": "license_number"
    },
    {
        "find": "%APPLICANT%",
        "column": "application.applicant_name"
    }
];

Now if I have a replacement function:

const replacePlaceholdersWithData = (content) => {
    var replacements = {};

    // Constructing the object like { "%STRING%" : "DB_VALUE", "%STRING_2%" : "DB_VALUE_2" }
    placeholders.filter((object) => replacements[object.find] = itemData[object.column]); // 👈 ISSUE HERE

    // @props https://stackoverflow.com/a/7975025/1743124
    content = content.replace(/%\w+%/g, function (all) {
        return replacements[all] || all;
    });

    return content;
};

...and a content like below:

const content = "A License numbered %LICENSE% from the %APPLICANT% is received";
console.log(replacePlaceholdersWithData(content));

// Will output: 'A License numbered 25/2022 from the %APPLICANT% is received'

You can guess that the first placeholder (%LICENSE%) will be replaced with '25/2022', but the second one won't be affected, because of the reading style at 👈: itemData["application.applicant_name"] won't match with any real column/key.

QUESTION: How can I resolve that issue?

I know I can use object.column.includes('.') along with object.column.split('.') and get an array of dimensions. But I am clueless, how can I use the array to get data from a multi-dimensional object dynamically?

object.column.split(".").reduce((acc, key) => acc[key], itemData). If you have possible nullish data in the nesting, use acc?.[key] — adiga
– adiga, Commented Jan 30, 2023 at 9:46

Andrew Parks · Accepted Answer · 2023-01-30 09:50:20Z

1

const itemData = {
    'license_number': '25/2022',
    'application': {
        'tracking_number': '535345345',
        'applicant_name': 'Misir Ali Humayun'
    }
};

const placeholder = [
  {
    "find": "%LICENSE%",
    "column": "license_number"
  },
  {
    "find": "%APPLICANT%",
    "column": "application.applicant_name"
  }
];

const content = "A License numbered %LICENSE% from the %APPLICANT% is received";

function replacePlaceholdersWithData(data, content) {
  placeholder.forEach(({find, column})=>content = content.replaceAll(find, lookup(data, column)))
  return content;
}
function lookup(data, path) {
  let [first, ...rest] = path.split('.');
  return rest.length ? lookup(data[first], rest.join('.')) : data[path];
}

console.log(replacePlaceholdersWithData(itemData, content));

answered Jan 30, 2023 at 9:50

Andrew Parks

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1 Comment

Mayeenul Islam Over a year ago

Bulls Eye Andrew. Thank you so much. Solved a huge problem for me. 💓

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