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## Half a million
### Using variables as keys
One possible and very useful way to get something from an object is using a
variable value. Sometimes you don't know in advance what the key will be.
Using variables allows your code to be flexible, let's see how to do it
```js
let greeting = 'hello'
let say = { hello: 'my friend', hoy: 'mate' }
// Here when we access it will use
console.log(say[greeting]) // -> 'my friend'
// It is exactly the same as doing
console.log(say['hello']) // -> 'my friend'
// But if we change the value of our variable:
greeting = 'hoy'
// The same code now returns another value
console.log(say[greeting]) // -> 'mate'
```
We are using the `value` of the variable, not the `identifier` to access the
property, so:
```js
console.log(say[greeting]) // -> 'mate'
console.log(say['greeting']) // -> undefined
console.log(say.greeting) // -> undefined
// greeting is the identifier, but we use it's value, here `'hoy'`
```
### Instructions
In this exercise, we will do a heist.
Our intel already worked the plan out and we are able to provide you with 2
variables:
- a `vault` object
- a `secret` string
Your goal is to steal the `secret` matching value from the `vault`.
Declare a variable `loot` and assign it's value using the variable `secret`
value as a key to access the matching value from the `vault`.
You must then replace the value from the vault's secret by a message of your
choice.
**Example**: if `vault` is `{ '53CR37-k0D3': '1/2 MM $' }` and `secret` is
`'53CR37-k0D3'`:
- `loot` should be `1/2 MM $`
- `vaut` should be `{ '53CR37-k0D3': 'I stole your $$' }`
> I sure hope you didn't do anything stupid, Jackie. \
> ― Ray Nicolette