Operations order

I hope you had no problems with the last task where you had to write the following code:

console.log(milkInGrams + waterInGrams - 150);

You can use several operations in a single command. The order of operation execution will depend on their priorities.

If an expression only contains arithmetic operations, their priority will be the same as taught at school: multiplication and division have the highest priority, addition and subtraction have the lowest one.

You can change the priority and the order of execution using round brackets. For example:

100 + 50 / 2;   // result is 125
(100 + 50) / 2; // result is 75

Of course, complex calculations can be simplified by breaking them down into several steps. For example, we could save the results of an operation into an intermediate variable and use it on the next step:

// This code will produce the same result
var totalWaterInGrams = milkInGrams + waterInGrams;
console.log(totalWaterInGrams - 150);

// as this one
console.log(milkInGrams + waterInGrams - 150);

It’s up to the developer if they want to use complex expressions made up of several operations or break the solution down into several steps consisting of simple operations. However, there is a golden rule: the simpler the code, the better.

Let’s try using more complex expressions.