public/subjects/keymaker

Keymaker

String as keys

So far we only used identifiers as keys for our Objects, but they are more flexible than variables as you can use any strings you want !

Declaring objects with strings as keys

When we want to use Strings that is not a valid identifier we must add string delimiters:

let usingIdentifier = { valid: true }
let usingString = { valid: true } // they are the same

But this syntax allow us more flexibility, if we need it:

let usingSpace = {
  'Still valid !': true,
  "double quotes works too": 1337,

  // but be careful:
  `backtick quote DO NOT WORK !`: false,
  // because of placeholders, they can not be used as easly :(
  // we will see a way to make that work later on :)
}

Has we can see, here in usingSpace, I have 2 spaces and a special character, but that still works, handy !

Accessing properties with strings as keys

And the most usefull one is actually to access properties values using strings as keys, for that, much like when we wanted to use a number to access a property in our arrays, we use [value] (square brackets):

let usingSpace = { 'Still valid !': true }

console.log(usingSpace['Still valid !']) // true !

Assigning a properties value with strings as keys

Much like arrays too, no surprise here:

usingSpace['New key form string'] = 55

It's the same old recipe, we access + use the = (assign operator) to set the value.

Instructions

Now that your are a true Keymaker you have a few tasks to do to assert your power.

• declare an object whiteRabbit with a key that is the rabbit emoji 🐰 with the value of your choosing
• declare a variable traitor that contains the value from the property 'Mr. Reagan' of the provided secretData object

Another way. Always another way.
― The Keymaker