Transform a JavaScript array using key value pairs sourced from a JSON document

Question

Transform a JavaScript array using key value pairs sourced from a JSON document

I am currently working on developing a feature to detect and flag inappropriate comments within my application.

One approach I am taking involves splitting the comment into an array of strings. I am now looking to implement a JavaScript function that can assign a numerical value to each array item based on predefined key-value pairs stored in a JSON object. If a matching key is not found, the item should be replaced with a 0.

The ultimate goal is to sum up all the numerical values in the final array to calculate a comment score.

For instance, given the initial array:

["Bad", "reallyBad", "Good", "Neutral", "Good"]

I plan to compare it against a JSON object with key-value pairs like:

{
    "reallyBad": -10,
    "Bad": -5,
    "Good": 5,
    "reallyGood": 10
}

Following these mappings, the updated array should look like this:

[-5, -10, 5, 0, 5]

If you have any insights on how to efficiently convert strings based on key-value pairs, I would greatly appreciate your guidance.

Any assistance you can provide would be immensely valuable.

javascript arrays json ecmascript-6

Answer 1

Answer №1

To efficiently process an array, you can utilize the `.map()` method. This function iterates over each item in the array, allowing you to apply a specific operation and obtain a desired output. In this case, you can use each string within the array as a key to retrieve the corresponding value from the ratings object.

const array = ["Bad", "reallyBad", "Good", "Neutral", "Good"];

const ratings = {
    "reallyBad": -10,
    "Bad": -5,
    "Good": 5,
    "reallyGood": 10
};

const ratingsArray = array.map(item => ratings[item] || 0);

console.log(ratingsArray);

Answer 2

To efficiently process an array, you can utilize the `.map()` method. This function iterates over each item in the array, allowing you to apply a specific operation and obtain a desired output. In this case, you can use each string within the array as a key to retrieve the corresponding value from the ratings object.

const array = ["Bad", "reallyBad", "Good", "Neutral", "Good"];

const ratings = {
    "reallyBad": -10,
    "Bad": -5,
    "Good": 5,
    "reallyGood": 10
};

const ratingsArray = array.map(item => ratings[item] || 0);

console.log(ratingsArray);

Answer 3

Answer №2

Simply assign values to the object properties or set a default value for Neutral.

var array = ["Bad", "reallyBad", "Good", "Neutral", "Good"],
    weights = { reallyBad: -10, Bad: -5, Good: 5, reallyGood: 10 },
    result = array.map(w => weights[w] || 0);
    
console.log(result);

Answer 4

Simply assign values to the object properties or set a default value for Neutral.

var array = ["Bad", "reallyBad", "Good", "Neutral", "Good"],
    weights = { reallyBad: -10, Bad: -5, Good: 5, reallyGood: 10 },
    result = array.map(w => weights[w] || 0);
    
console.log(result);

Answer 5

Answer №3

If you want to transform an array using the Array.map() method, you can do it easily.

Give this a shot:

var array = ["Apple", "Banana", "Cherry", "Date", "Elderberry"];
var object = {
    "Apple": "A",
    "Banana": "B",
    "Cherry": "C",
    "Date": "D",
    "Elderberry": "E"
};

var transformedArray = array.map((item) => object[item] || "Unknown");

console.log(transformedArray);

Answer 6

If you want to transform an array using the Array.map() method, you can do it easily.

Give this a shot:

var array = ["Apple", "Banana", "Cherry", "Date", "Elderberry"];
var object = {
    "Apple": "A",
    "Banana": "B",
    "Cherry": "C",
    "Date": "D",
    "Elderberry": "E"
};

var transformedArray = array.map((item) => object[item] || "Unknown");

console.log(transformedArray);

Transform a JavaScript array using key value pairs sourced from a JSON document

Answer №1

Answer №2

Answer №3

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