Hey everyone i'm currently learning more about javascript and wanted to know how to do something like this in PHP which is a multidimensional array with key pairs

But how would i do something like this in javascript this is what i have attempted and so far only got errors i'm using an object rather than array if i'm going about this wrong please tell me haha

Why do you try to make an Object? In Object JS doing it other way(with ':' and ',')

Butif you need a multidimensional array do this way:

Create Key Value Pair Array Using Javascript, Our today's article is simple but demanding. Most of the new or experience java-script developer required below code. In this code snippet I have define java-script array values are in the form of key and value. The map method creates a new array with the results of calling a function for every array element. The map method calls the provided function once for each element in an array, in order. Note: map does not execute the function for array elements without values. Note: this method does not change the original array.

When you run this code, you’ll be given a warning that a key should be provided for list items. A “key” is a special string attribute you need to include when creating lists of elements. We’ll discuss why it’s important in the next section. Let’s assign a key to our list items inside numbers.map and fix the missing key issue. Aug 22, 2019  Array.from lets you create Arrays from: array-like objects (objects with a length property and indexed elements); or; iterable objects (objects such as Map and Set). Array.from has an optional parameter mapFn, which allows you to execute a map function on each element of the array being created. More clearly, Array.from(obj, mapFn, thisArg). That’s the same, because Object.fromEntries expects an iterable object as the argument. Not necessarily an array. And the standard iteration for map returns same key/value pairs as map.entries.So we get a plain object with same key/values as the map. A Set is a special type collection – “set of values” (without keys), where each value may occur only once.

Would i just access the variables in the array like

Hi Tunde,

Since an array is an object in javascript, would something like this suit you?

Windows 8.1 pro serial key generator. You can access each property either like this: multiarray.cat.name or if you prefer it to be like php: multiarray['cat']['legs']

Oh, I see! What you calling array is collection indeed. To access it like hotels['hilton']['name'] you need such object:

So, the solution to keep this data you need is:

Your awesome haha sorry i thought it was called the same in js but thats exactly what i'm looking for are there any methods to add new items into the collection ?

Try to make it this way:

Awesome that works thanks for all your help mate :D

These are commonly known as Object Literals in JavaScript but yes they are indeed associative arrays since the indexes are named (with a string) and not a numeric index.

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Introduction

From the classic forloop to the forEach() method, there are various techniques and methods used to iterate through datasets in JavaScript. One of the most popular methods is the .map() method. .map() creates an array from calling a specific function on each item in the parent array. .map() is a non-mutating method in that it creates a new array as opposed to mutating methods, which only make changes to the calling array.

This method can have many uses when working with arrays. In this tutorial, we’ll look at four noteworthy uses of the .map() in JavaScript: calling a function of array elements, converting strings to arrays, rendering lists in JavaScript libraries, and reformatting array objects.

Calling a Function on Each Item in an Array

.map() accepts a callback function as one of its arguments, and an important parameter of that function is the current value of the item being processed by the function. This is a required parameter. With this parameter, we can modify each individual item in an array and create a new function off of it.

Here’s an example:

This can be simplified further to make it cleaner with:

Having code like sweetArray.map(makeSweeter) makes your code a bit more readable.

Converting a String to an Array

Generate Key Javascript Map Array Examples

.map() is known to belong to the Array prototype. Let’s use it to convert a String to an Array. We are not developing the method to work for strings here. Rather, we will use the special .call() method.

Everything in JavaScript is an object and methods are functions attached to these objects. .call() allows us to use the context of one object on another. Therefore, we would be copying the context of .map() in an array over to a string.

Generate Key Javascript Map Array To String

.call() can be passed arguments of the context to be used and parameters for the arguments of the original function.

Here’s an example:

Here, we used the context of .map() on a String and passed an argument of the function that .map() expects.

This functions like the .split() method of a String only that each individual string characters can be modified before being returned in an array.

Rendering Lists in JavaScript Libraries

JavaScript libraries like React use .map() to render items in a list. This requires JSX syntax, however, as the .map() method is wrapped in JSX syntax.

Generate Key Javascript Map Array Download

Here’s an example of a React component:

This is a stateless component in React, which renders a div with a list. The individual list items are rendered using .map() to iterate over the names array initially created. This component is rendered using ReactDOM on the DOM element with id of root.

Reformatting Array Objects

.map() can be used to iterate through objects in an array and, in a similar fashion to traditional arrays, modify the content of each individual object and return a new array. This modification is done based on what is returned in the callback function.

Js Array To Map

Here’s an example:

Here we modified each object in the array using the bracket and dot notation. This use case can be employed to process or condense received data before being saved or parsed on a frontend application.

Conclusion

Javascript Convert Map To Array

In this tutorial, we looked at four uses of the .map() method in JavaScript. In combination with other methods, the functionality of .map() can be extended. For more information, see our How To Use Array Methods in JavaScript: Iteration Methods article.