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README.md | 4 years ago |
README.md
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 providedsecretData
object
Another way. Always another way.
― The Keymaker