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Exercise 1

What values do the following expressions evaluate to?

false || (true && false);
true || (1 + 2);
(1 + 2) || true;
true && (1 + 2);
false && (1 + 2);
(1 + 2) && true;
(32 * 4) >= 129;
false !== !true;
true === 4;
false === (847 === '847');
false === (847 == '847');
(!true || (!(100 / 5) === 20) || ((328 / 4) === 82)) || false;

Solution

Expression	Value
`false \|\| (true && false)`	`false`
`true \|\| (1 + 2)`	`true`
`(1 + 2) \|\| true`	`3`
`true && (1 + 2)`	`3`
`false && (1 + 2)`	`false`
`(1 + 2) && true`	`true`
`(32 * 4) >= 129`	`false`
`false !== !true`	`false`
`true === 4`	`false`
`false === (847 === '847')`	`true`
`false === (847 == '847')`	`false`
`(!true \|\| (!(100 / 5) === 20) \|\| ((328 / 4) === 82)) \|\| false`	`true`

Remember that expressions involving the logical operators of || and && use short-circuit evaluation; they also return truthiness values.

The last expression needs some explanation:

!true is false
!(100 / 5) === 20) is also false because !(100 / 5) is a boolean value, and === always returns false when the operands have different types.
((328 / 4) === 82) is true
Put together, items 1-3 combine with || as (false || false || true), which is true.
Using the value from item 4 results in true || false, which is true.

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