Combining keys array and values array to create an object in JavaScript

Question

Combining keys array and values array to create an object in JavaScript

I currently have the following arrays:

var keys = [ "color", "size" ];
var values = [ "blue", "medium" ];

My goal is to transform them into an object like this:

{ color: "blue", size: "medium" }

In Python, you can achieve this easily with dict(zip(keys,values)). Is there a similar method in jQuery or vanilla JavaScript, or do I need to take the longer route?

javascript json object

Answer 1

Answer №1

Here is a concise ES6 one-liner solution that leverages Array reduce:

const properties = ['color', 'size'];
const values = ['red', 'large'];
const combined = properties.reduce((object, property, index) => ({ ...object, [property]: values[index] }), {});

console.log(combined);

Answer 2

Here is a concise ES6 one-liner solution that leverages Array reduce:

const properties = ['color', 'size'];
const values = ['red', 'large'];
const combined = properties.reduce((object, property, index) => ({ ...object, [property]: values[index] }), {});

console.log(combined);

Answer 3

Answer №2

A simple JavaScript function may look like this:

function createObject(keys, values) {
    var obj = {};
    for (var i = 0; i < keys.length; i++)
         obj[keys[i]] = values[i];
    return obj;
}

Additionally, it is worth mentioning that in JavaScript, you can easily implement functions such as zip using higher order types, which brings some functional programming concepts into the language!

Answer 4

A simple JavaScript function may look like this:

function createObject(keys, values) {
    var obj = {};
    for (var i = 0; i < keys.length; i++)
         obj[keys[i]] = values[i];
    return obj;
}

Additionally, it is worth mentioning that in JavaScript, you can easily implement functions such as zip using higher order types, which brings some functional programming concepts into the language!

Answer 5

Answer №3

Utilize lodash library for efficient data manipulation.

Check out _.zipObject function from lodash documentation

See how to use it with the following example:

_.zipObject(['x', 'y'], [5, 10]);
// ➜ { 'x': 5, 'y': 10 }

Answer 6

Utilize lodash library for efficient data manipulation.

Check out _.zipObject function from lodash documentation

See how to use it with the following example:

_.zipObject(['x', 'y'], [5, 10]);
// ➜ { 'x': 5, 'y': 10 }

Answer 7

Answer №4

Looking at a different approach that hasn't been mentioned yet, I believe:

const properties = ["color", "font-size"];
const styles = ["red", "16px"];
const output = {};

properties.forEach((property, index) => output[property] = styles[index]);
console.log(output);

Answer 8

Looking at a different approach that hasn't been mentioned yet, I believe:

const properties = ["color", "font-size"];
const styles = ["red", "16px"];
const output = {};

properties.forEach((property, index) => output[property] = styles[index]);
console.log(output);

Answer 9

Answer №5

To merge two arrays together, you can utilize the map method first and then transform them into an object using Object.fromEntries.

var categories = ["fruit", "vegetable"];
var values = ["apple", "carrot"];

var combinedArray = categories.map((category, index) => {
  return [categories[index], values[index]];
});
// → [["fruit", "apple"], ["vegetable", "carrot"]]

var mergedObject = Object.fromEntries(combinedArray);
// → {fruit: "apple", vegetable: "carrot"}
console.log(mergedObject);

Answer 10

To merge two arrays together, you can utilize the map method first and then transform them into an object using Object.fromEntries.

var categories = ["fruit", "vegetable"];
var values = ["apple", "carrot"];

var combinedArray = categories.map((category, index) => {
  return [categories[index], values[index]];
});
// → [["fruit", "apple"], ["vegetable", "carrot"]]

var mergedObject = Object.fromEntries(combinedArray);
// → {fruit: "apple", vegetable: "carrot"}
console.log(mergedObject);

Answer 11

Answer №6

Implementing a functional approach while prioritizing immutability:

const createZipObject = keys => values => keys.reduce((obj, key, index) => ({ ...obj, [key]: values[index] }), {})

const keysArray = ['apple', 'banana', 'cherry', 'date']
const valuesArray = ['elephant', 'flamingo', 'giraffe', 'hippopotamus']

const customObject = createZipObject(keysArray)(valuesArray)

console.log(customObject)

Answer 12

Implementing a functional approach while prioritizing immutability:

const createZipObject = keys => values => keys.reduce((obj, key, index) => ({ ...obj, [key]: values[index] }), {})

const keysArray = ['apple', 'banana', 'cherry', 'date']
const valuesArray = ['elephant', 'flamingo', 'giraffe', 'hippopotamus']

const customObject = createZipObject(keysArray)(valuesArray)

console.log(customObject)

Answer 13

Answer №7

To convert key-value pairs into an object, you can utilize the reduce() method.

/**
 * Creates a new object from parallel arrays of keys and values.
 *
 * @param   {string[]} keys      - Array of keys.
 * @param   {object[]} vals      - Array of values.
 * @param   {object}   [ref={}]  - Optional existing object to modify.
 *
 * @returns {object} - Object with new key-value pairs applied.
 */
function convertToObject(keys, vals, ref) {
  return keys.length === vals.length ? keys.reduce(function(obj, key, index) {
    obj[key] = vals[index];
    return obj;
  }, ref || {}) : null;
}

var keys   = ["name", "age"];
var values = ["John", 30];

document.body.innerHTML = '<pre>' + JSON.stringify(convertToObject(keys, values), null, 2) + '</pre>';

Answer 14

To convert key-value pairs into an object, you can utilize the reduce() method.

/**
 * Creates a new object from parallel arrays of keys and values.
 *
 * @param   {string[]} keys      - Array of keys.
 * @param   {object[]} vals      - Array of values.
 * @param   {object}   [ref={}]  - Optional existing object to modify.
 *
 * @returns {object} - Object with new key-value pairs applied.
 */
function convertToObject(keys, vals, ref) {
  return keys.length === vals.length ? keys.reduce(function(obj, key, index) {
    obj[key] = vals[index];
    return obj;
  }, ref || {}) : null;
}

var keys   = ["name", "age"];
var values = ["John", 30];

document.body.innerHTML = '<pre>' + JSON.stringify(convertToObject(keys, values), null, 2) + '</pre>';

Answer 15

Answer №8

With the new Object.fromEntries feature, we can achieve the following:

const properties = [ "name", "age" ];
const details = [ "John Doe", "30" ];
const person = Object.fromEntries(
    details.map((detail, index) => [properties[index], detail])
);

console.log(person);

Answer 16

With the new Object.fromEntries feature, we can achieve the following:

const properties = [ "name", "age" ];
const details = [ "John Doe", "30" ];
const person = Object.fromEntries(
    details.map((detail, index) => [properties[index], detail])
);

console.log(person);

Answer 17

Answer №9

Here's an illustration showcasing the use of consts (non-modifying) without any external libraries.

const keys = ["Alice", "Bob", "Carla"];
const values = [30, 5, 70];
const obj = keys.reduce((acc, key, i) => {
  acc[key] = values[i];
  return acc;
}, {});
console.log(obj);

If you're open to utilizing libraries, you can explore lodash zipobject, which fulfills your specified requirements.

Answer 18

Here's an illustration showcasing the use of consts (non-modifying) without any external libraries.

const keys = ["Alice", "Bob", "Carla"];
const values = [30, 5, 70];
const obj = keys.reduce((acc, key, i) => {
  acc[key] = values[i];
  return acc;
}, {});
console.log(obj);

If you're open to utilizing libraries, you can explore lodash zipobject, which fulfills your specified requirements.

Answer 19

Answer №10

To retrieve the object containing the entries, you can arrange the arrays by transposing them.

const
    transpose = (r, a) => a.map((v, i) => [...(r[i] || []), v]),
    keys = [ "color", "size" ],
    values = [ "red", "medium" ],
    result = Object.fromEntries([keys, values].reduce(transpose, []));

console.log(result);

Answer 20

To retrieve the object containing the entries, you can arrange the arrays by transposing them.

const
    transpose = (r, a) => a.map((v, i) => [...(r[i] || []), v]),
    keys = [ "color", "size" ],
    values = [ "red", "medium" ],
    result = Object.fromEntries([keys, values].reduce(transpose, []));

console.log(result);

Answer 21

Answer №11

function mergeObjects(keys, values) {
    var newObject = {};
    if (keys.length !== values.length) {
        return null;
    }
    for (var i in keys) {
        newObject[keys[i]] = values[i];
    }
    return newObject;
};

var customizedObject = mergeObj(yourKeys, yourValues);

Answer 22

function mergeObjects(keys, values) {
    var newObject = {};
    if (keys.length !== values.length) {
        return null;
    }
    for (var i in keys) {
        newObject[keys[i]] = values[i];
    }
    return newObject;
};

var customizedObject = mergeObj(yourKeys, yourValues);

Answer 23

Answer №12

Here's a code snippet that can convert nested arrays into an array of key-value objects.

var keys = [
  ['#000000', '#FFFFFF'],
  ['#FFFF00', '#00FF00', '#00FFFF', '#0000FF'],
];
var values = [
  ['Black', 'White'],
  ['Yellow', 'Green', 'Cyan', 'Blue'],
];
const createObject = xs => ys => xs.reduce( (obj, x, i) => ({ ...obj, [x]: ys[i] }), {})
var newArray = keys.map((el, i) => createObject(keys[i]) (values[i]));

console.log(newArray);

The resulting output is as follows:

[
  {
    "#000000": "Black",
    "#FFFFFF": "White"
  },
  {
    "#FFFF00": "Yellow",
    "#00FF00": "Green",
    "#00FFFF": "Cyan",
    "#0000FF": "Blue"
  }
]

Answer 24

Here's a code snippet that can convert nested arrays into an array of key-value objects.

var keys = [
  ['#000000', '#FFFFFF'],
  ['#FFFF00', '#00FF00', '#00FFFF', '#0000FF'],
];
var values = [
  ['Black', 'White'],
  ['Yellow', 'Green', 'Cyan', 'Blue'],
];
const createObject = xs => ys => xs.reduce( (obj, x, i) => ({ ...obj, [x]: ys[i] }), {})
var newArray = keys.map((el, i) => createObject(keys[i]) (values[i]));

console.log(newArray);

The resulting output is as follows:

[
  {
    "#000000": "Black",
    "#FFFFFF": "White"
  },
  {
    "#FFFF00": "Yellow",
    "#00FF00": "Green",
    "#00FFFF": "Cyan",
    "#0000FF": "Blue"
  }
]

Answer 25

Answer №13

Solving the problem using a for...of loop.

let properties = ["color", "size"];
let measurements = ["red", "large"];
const output = {};
for (let [index, property] of properties.entries())
  output[property] = measurements[index];
console.log(output);

Alternatively, you have the option to utilize a toolkit like lodash that offers a function called zipObject. Example:

const properties = ["color", "size"];
const measurements = ["red", "large"];
const result = _.zipObject(properties, measurements);
console.log(result);

Answer 26

Solving the problem using a for...of loop.

let properties = ["color", "size"];
let measurements = ["red", "large"];
const output = {};
for (let [index, property] of properties.entries())
  output[property] = measurements[index];
console.log(output);

Alternatively, you have the option to utilize a toolkit like lodash that offers a function called zipObject. Example:

const properties = ["color", "size"];
const measurements = ["red", "large"];
const result = _.zipObject(properties, measurements);
console.log(result);

Answer 27

Answer №14

The jQuery-Plugins project features the HelperFunctions module which includes a zip functionality.

//...
zip: function(data, data2, processor) {
    var result = [];
    var processor = processor || dummyFunction;
        $.each(data, function(index, item){
        if (data2[index]) { result.push([item, data2[index]]); }
    });
    return result;
}
//...

Answer 28

The jQuery-Plugins project features the HelperFunctions module which includes a zip functionality.

//...
zip: function(data, data2, processor) {
    var result = [];
    var processor = processor || dummyFunction;
        $.each(data, function(index, item){
        if (data2[index]) { result.push([item, data2[index]]); }
    });
    return result;
}
//...

Combining keys array and values array to create an object in JavaScript

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

Answer №6

Answer №7

Answer №8

Answer №9

Answer №10

Answer №11

Answer №12

Answer №13

Answer №14

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