How to use String.prototype function with JSON data?

Question

I have code

let letters = [
 {"ae": "a"},
 {"ac": "c"}
];

String.prototype.swapLetters = function(){ 
    return this.replace(/ae/g, 'a').replace(/ac/g, 'c');
}

var decLetter= new String(response[i].name).swapLetters();

How can I use my prototype function with JSON object values? JSON will be generated dynamically.

You could use JSON.stringify, call your function, then use JSON.parse to change it back into an object. It entirely depends on what you want to do, your question is very vague — Kobe
– Kobe, Commented Oct 29, 2019 at 15:01
I just want to swap letters for string. I have input when I type a response should be a. When I type ae response also should be a. It's like accent folding for autocomplete — MMPL1
– MMPL1, Commented Oct 29, 2019 at 15:05
I see no JSON data here. letters is an array of objects. JSON is a text format. — Heretic Monkey
– Heretic Monkey, Commented Oct 29, 2019 at 15:24

IceMetalPunk · Accepted Answer · 2019-10-29 15:08:53Z

1

Iterate over the array and apply the function to each one:

String.prototype.swapLetters = function() {
    let result = this;
    letters.forEach(pair => {
      const key = Object.keys(pair)[0];
      const value = pair[key];
      result = result.replace(key, value);
    });
    return result;
}

Of course, if you refactor your data, you can make this much simpler:

let letters = {
    "ae": "a",
    "ac": "c"
};

String.prototype.swapLetters = function() {
    return Object.keys(letters).reduce((result, replacer) => {
        return result.replace(replacer, letters[replacer]);
    }, this);
}

answered Oct 29, 2019 at 15:08

IceMetalPunk

5,6074 gold badges21 silver badges29 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

MMPL1 Over a year ago

Thank you! This is what I'm looking for!

Collectives™ on Stack Overflow

How to use String.prototype function with JSON data?

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related