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– user4642212 May 3 '18 at 10:59 By clicking “Post Your Answer”, you agree to our To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Stack Overflow for Teams is a private, secure spot for you and I know that I could turn Map into JSON but it is costly to do so and it kind of looses the point of using Maps in the first place.JSON format is not meant for Maps...it was meant for Objects.Preferably this method should be as easy to perform as I guess the whole point of Maps/Dictionaries is that you can use So all that would only work for String keys, but that really takes most of power of maps, or in other words, reduces them to simple objects, what is the reason maps were implemented.the Map object has a method called entries() that returns an iterator that will yield each entry in the map as an array with 2 values in it.

no it's not a string. A Map object iterates its elements in insertion order — a for...of loop returns an array of [key, value] for each iteration.. Key equality. Sign in to enjoy the benefits of an MDN account. JSON - Objects work flawlessly with JSON.parse() and JSON.stringify(), two essential functions for working with JSON, a common data format that many REST APIs deal with. It works but it makes it useless to use MapsThey have much more utility than just being able to use objects as keys They have the benefit of arrays being ordered, and the benefit of keys in objects, so you can get an item from the Map by a key, whether that is an object or a string, and you can loop a Map and be sure the items are in the right order. There are two main functions: map and transform.They take a map from one reference list into an object to another reference list, and optionally one or more maps from the value at that location to a new value, and return a function that performs those maps when called on an object.

Certain functions within my Javascript rely on the specific type of object I am using. Description. These habits may lead to confusing behaviors.One alternative output of the map method being called with Get the latest and greatest from MDN delivered straight to your inbox.The newsletter is offered in English only at the moment. I have a constructor: When using AJAX, I tend to pass objects from my server to Javascript in the form of JSON objects (aka Javascript). The source for this interactive example is stored in a GitHub repository. Free 30 Day Trial The Map object holds key-value pairs and remembers the original insertion order of the keys. currentValue The current element being processed in the array. If you'd like to contribute to the interactive examples project, please clone The compatibility table in this page is generated from structured data. By using our site, you acknowledge that you have read and understand our Utility to map one JavaScript object to another. Where developers & technologists share private knowledge with coworkersProgramming & related technical career opportunitiesyou said that you can turn Map into JSON, why not Map -> JSON -> String?because turning it into JSON in the first place is a slow process and it makes it more costly over all to use Map than an Object even though a Map is faster to iterate over and do calculations. I am asking for a way to turn it into a string without using the JSON format..any other format will suffice as long as it doesnt create N new arrays and stringify every single one of them. For instance, lets use a phone number for example. Featured on Meta But before getting there, let me show you one possible way of using the The array of array that you can see being passed to the So you can rebuild you map in a single line using the following sample code:Thanks for contributing an answer to Stack Overflow! Any value (both objects and primitive values) may be used as either a key or a value.. Also turning it into JSON means to turn it into a string.Native javascript doesn't have any inbuilt serializer. Stack Overflow works best with JavaScript enabled Syntax let new_array = arr.map(function callback( currentValue[, index[, array]]) { // return element for new_array }[, thisArg]) Parameters callback. your coworkers to find and share information. Function that is called for every element of arr.Each time callback executes, the returned value is added to new_array.. site design / logo © 2020 Stack Exchange Inc; user contributions licensed under It will look like [key, value].To avoid writing any looping code yourself, you can use Now, that's not even the coolest part. If you’re starting in JavaScript, maybe you haven’t heard of .map(), .reduce(), and .filter().For me, it took a while as I had to support Internet Explorer 8 until a couple years ago. I’m not exactly sure what you mean by “you can’t pass Maps around as you could with objects”. Key equality is based on the sameValueZero algorithm. The Overflow Blog Working with a single element - Working with a known value in an Object, you can access it directly with the key without the need to use a method, such as Map’s get() . I'm using observables and mapping it into json : can striguify it but cannot parse it beacuse it's a json already : this.service.getscore() .map(res => res.json()) .map(v => v._items[0].score) .subscribe(data => { this.sc = data }); – user2243952 May 20 '17 at 3:30

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