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Variables

# Mathematical Assignment Operators

Let's consider how we can use variables and math operators to calculate new values and assign them to a variable. Check out the example below:

``````let w = 4;
w = w + 1;

console.log(w); // Output: 5
``````

In the example above, we created the variable `w` with the number `4` assigned to it. The following line, `w = w + 1`, increases the value of `w` from `4` to `5`.

Another way we could have reassigned `w` after performing some mathematical operation on it is to use built-in mathematical assignment operators. We could re-write the code above to be:

``````let w = 4;
w += 1;

console.log(w); // Output: 5
``````

In the second example, we used the `+=` assignment operator to reassign `w`. We're performing the mathematical operation of the first operator `+` using the number to the right, then reassigning `w` to the computed value.

We also have access to other mathematical assignment operators: `-=`, `*=`, and `/=` which work in a similar fashion.

``````let x = 20;
x -= 5; // Can be written as x = x - 5
console.log(x); // Output: 15

let y = 50;
y *= 2; // Can be written as y = y * 2
console.log(y); // Output: 100

let z = 8;
z /= 2; // Can be written as z = z / 2
console.log(z); // Output: 4
``````

Let's practice using these mathematical assignment operators!

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