Given the following code:

var x = variable[y];

What is y:

1. Index
2. Key
3. Index of key
4. Array

var x = s.toLowerCase();
var l = s.length;

Indicate the type of each:

1. s
2. x
3. s.toLowerCase()
4. s.toLowerCase
5. s.length
6. l

Indicate whether this is an expression or a statement:

1. l
2. l = 4;
3. l == 4
4. if (l == 4) { console.log("yes"); }
5. console.log("yes");
6. "yes"
7. `console.log(l == 4 ? "yes" : "no")

How can you tell whether something is a statement? How can you tell whether something is an expression

Bonus: List all statements in the code above List all expressions in the code above

Write code for the following:

1. Declare a variable called x and initialize it with the string "Hello".
2. Declare a variable called y and initialize it with the property length of x.
3. Declare a variable called z and initialize it with the result of calling the method toUpperCase on x