Lesson 3: Operators

Operators are used to carry out an operation to our variables. To add and subtract variables from each other we must use some mathematical operators. Look at the table below and then edit the TRY ME below.

let number = 1 + 2;
console.log(number);

Try It!

Switch into the javaScript file below and run the code. Now use a similar format as below to divide 21 by 7 and log the result to the console.

Compound operators are abbreviated and compact operators which can carry out the roles of two or more operators. For example the operators in the table below all give a value to an element using an assignment operator while preforming a mathematical calculation on the variable.

let number = 2;
number += 8
console.log(number);

Try It!

See how the code below changes the value of the variable. First we add 5 to the variable and we then subtract 2 from the variable. Now try and create a variable called number and assign it an even number value. Then used the compound divide assignment operator to divide number by 2 and log the result to the console.

As we can remember from the previous section the Boolean type has two main values; true and false. Boolean operators return either true or false after comparing or checking whether variables, numbers and other objects meet certain criteria. These will be heavily used in the next section, flow and conditionals.