Can one key have multiple values JavaScript?

6 Answers. You could take a Set for multiple values for a key of a map. A Map data structure is a key/value store. Use an array of values, like above, in order to have a Map use a the key “1” to map to multiple value.

How can I store multiple values in one key HashMap?

How to add multiple values per key to a Java HashMap

  1. Stick with the standard APIs and add a collection class like a ‘Vector’ or ‘ArrayList’ to your map or set.
  2. Use the MultiMap and MultiValueMap classes from the Apache Commons library.

How can I store multiple values in JavaScript?

With JavaScript array variables, we can store several pieces of data in one place. You start an array declaration with an opening square bracket, end it with a closing square bracket, and put a comma between each entry, like this: var sandwich = [“peanut butter”, “jelly”, “bread”].

Can key value pairs have multiple values?

In python, if we want a dictionary in which one key has multiple values, then we need to associate an object with each key as value. This value object should be capable of having various values inside it. We can either use a tuple or a list as a value in the dictionary to associate multiple values with a key.

How do I set multiple values in localStorage?

If you want to store two different values in localStorage then you can do somrthing like this :

  1. setItem in localStorage two times with different keys. localStorage.
  2. Store both the values in an object. var obj = { “message”: taskMessage, “name”: taskName } var val = localStorage.

Can a Key have multiple values C++?

Some keys can have multiple values. For example, “the” => “dog” || “wall” || “cat” || “house”. The value is randomly chosen from those for that key.

Can a map have multiple values?

HashMap can be used to store key-value pairs. But sometimes you may want to store multiple values for the same key. For example: For Key A, you want to store – Apple, Aeroplane.

How do I store multiple values in one array?

Single array to store multiple variables in each element

  1. char shape (l for line, r for rectangle, c for circle)
  2. Start x value.
  3. Start y value.
  4. width (rectangle), or ending x (line), or radius (circle)
  5. height (rectangle), or ending y (line), or radius (circle)

Can HashTable have multiple values?

As mentioned earlier in the post, it is not possible to use the same key for different values in Hashtable(key, value). Although, you may create a List or some object as a value in the key/value pair of HashTable.

Can a Key have multiple values Ruby?

Multiple Values For One Key Words are unique, but they can have multiple values (definitions) associated with them. You can do this in Ruby!

Can a C++ function return multiple values?

While C++ does not have an official way to return multiple values from a function, one can make use of the std::pair , std::tuple , or a local struct to return multiple values.

How to add many values to one key in JavaScript Object?

I have an object var obj = {key1: “value1”, key2: “value2”}; I want to add multiple values or array of values to key1 or key2 e.g var obj = {key1: “arrayOfValues”, key2: “value2”}; is it possible? basically I want to send it to php for process. You can make objects in two ways. Also you can be define values in array with/without initial size.

How are key value pairs used in JavaScript?

You can group related data together into a single data structure by using a JavaScript object, like this: An object contains properties, or key-value pairs. The desk object above has four properties.

What should the key be in a JavaScript Object?

Each key in your JavaScript object must be a string, symbol, or number. Take a close look at the example below. The key names 1 and 2 are actually coerced into strings. It’s a difference made clear when you print the object. There’s another rule to keep in mind about key names: if your key name contains spaces, you need to wrap it in quotes.

How to store multiple values under the same key?

If you call put (K, V) twice, with the same key but different values, the multimap contains mappings from the key to both values. I use Map for associating multiple values with a key in a Map. This way, I can store multiple values of different types associated with a key.