If StatementsĪn if statement checks a boolean value and only executes a block of code if that value is true. But for now, keep in mind that boolean values contain true or false, and you can use operators like &, ||, and ! on them. There is a whole field of study devoted to boolean logic, so check that out if it sounds interesting.

(If this bothers you because it doesn’t account for animals like bats, beavers, and dolphins… check out the homework!) Then it points the isMammal variable to that value. It then takes those values and feeds them into the & operator, which creates yet another boolean value. The and operator evaluates to true whenever the two boolean values on either side of it are also true.įirst this code takes the opposite of the canSwim and canFly variables to create two new boolean values.

You can combine two boolean values using the and operator, which looks like two ampersands: &. Similar to how you can add two numbers using the + operator to get a third number, or subtract them using the - operator, you can also operate on two boolean values to get a third boolean value. First you take the inequality score >= 90 and get a boolean value from it (in this case, true), and then you point the isGradeA variable to that value. If that line of code is confusing, try reading the right side first. So at the end of this code, isGradeA is holding the boolean value of true. In this case, the inequality is true because 95 is greater than 90. It then creates a boolean variable named isGradeA and sets it equal to the result of the inequality score >= 90.

This code creates a variable named score and sets it equal to 95. Let score = 95 let isGradeA = score >= 90

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