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72 lines
1.9 KiB
72 lines
1.9 KiB
4 years ago
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## Keymaker
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### String as keys
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So far we only used `identifiers` as keys for our `Objects`, but they are more
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flexible than variables as you can use **any** strings you want !
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#### Declaring objects with `strings` as `keys`
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When we want to use `Strings` that is not a valid `identifier` we must add
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string delimiters:
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```js
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let usingIdentifier = { valid: true }
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let usingString = { valid: true } // they are the same
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```
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But this syntax allow us more flexibility, if we need it:
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```js
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let usingSpace = {
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'Still valid !': true,
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"double quotes works too": 1337,
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// but be careful:
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`backtick quote DO NOT WORK !`: false,
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// because of placeholders, they can not be used as easly :(
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// we will see a way to make that work later on :)
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}
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```
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Has we can see, here in usingSpace, I have 2 spaces and a special character, but
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that still works, handy !
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#### Accessing properties with `strings` as `keys`
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And the most usefull one is actually to access properties values using strings
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as keys, for that, much like when we wanted to use a number to access a property
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in our arrays, we use `[value]` _(square brackets)_:
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```js
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let usingSpace = { 'Still valid !': true }
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console.log(usingSpace['Still valid !']) // true !
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```
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#### Assigning a properties value with `strings` as `keys`
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Much like arrays too, no surprise here:
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```js
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usingSpace['New key form string'] = 55
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```
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It's the same old recipe, we access + use the `=` _(assign operator)_ to set the
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value.
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### Instructions
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Now that your are a true **Keymaker** you have a few tasks to do to assert your
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power.
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- declare an object `whiteRabbit` with a key that is the rabbit emoji 🐰 with
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the value of your choosing
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- declare a variable `traitor` that contains the value from the property
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`'Mr. Reagan'` of the provided `secretData` object
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> Another way. Always another way. \
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> ― The Keymaker
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