Test Multiple Conditions With the || Operator

You learned to use the and operator to perform an action of two or 0:00 more conditions evaluate to true. 0:03 There are times you'll want to perform an action if either of two possible 0:06 conditions are true. 0:09 For example, if it's hot or the indoor pool is open, then I'll go swimming. 0:10 In this case, either condition can be true. 0:16 It might be really cold outside, but the indoor pool is heated and warm, so 0:18 I'll go swimming. 0:22 On the other hand, the indoor pool may be closed but it's hot so 0:23 I'll go swimming in the ocean. 0:27 To run this type of test, you use the or operator. 0:29 It's called or because the entire condition returns true if either 0:33 condition one or condition two evaluates the true. 0:38 The logical or operator is represented by two pipe characters. 0:41 On most keyboard, the pipe characters is on the same key as the backslash. 0:46 Hold down the shift key to type it. 0:49 All right, let's see how the or operator works. 0:52 Say you let someone agree to the terms and 0:54 service of your website by typing either yes or just the letter Y. 0:57 They can type either one or other. 1:01 Back in the console, I'll store the response in a variable named agree and 1:03 assign it the string yes. 1:09 I can then use the logical or operator like this. 1:11 Agree strictly equals yes or 1:15 agree strictly equals y. 1:19 Just like with the logical and operator, 1:23 there's really two separate conditions here. 1:26 Each condition gets tested separately and produces its own true or false values. 1:29 The value in the agree variable is yes. 1:34 So the first test asks if yes is strictly equal to yes, it is. 1:37 So this first condition is true. 1:42 The second test asks if yes is strictly equal to y, this is not true. 1:45 The role of the or operator here is to ask if condition one is true or 1:51 condition two true. 1:56 In this case, one is true and 1:58 that's enough this entire condition evaluate to true. 2:00 Let's continue with two more examples. 2:05 I'll change the value and agree to just y. 2:07 Now the first condition is false, y is not equal to yes, 2:13 but the second condition y is equal to y is true. 2:18 So the entire condition is also true. 2:22 Remember, just the one test needs to pass. 2:24 What if I set the value of agree to n? 2:29 The first condition is false, and the second condition is also false. 2:34 In this case, because neither condition is true, 2:38 the whole condition evaluates the false. 2:41 Keep in mind that you need to create complete conditions on either side of 2:44 the or operator. 2:48 For example, you can't do something like this. 2:49 Even though it feels like this should be correct, 2:53 it really reads like, if agree is equal to yes or y. 2:57 Whatever appears on either side of the or operator has to be a complete condition. 3:01 Y by itself isn't really condition. 3:05 So remember, you need to have full conditions on either side. 3:08 In the logical end and or operator examples, 3:13 I've used just two conditions and a single logical operator. 3:15 You can actually have more than one of each operator. 3:20 For example, you can test if condition one is true, and condition two, 3:23 and condition three, and so on. 3:28 There's no limit to the number of logical and operators you string together. 3:30 Just remember that with the and operator, every single condition must be true for 3:34 the entire condition to evaluate to true. 3:39 If just one of the conditions is false, then the entire condition is false. 3:41 You can also string together multiple logical or operators. 3:46 In this case, only one of the conditions needs to be true for 3:49 the entire larger condition to evaluate to true. 3:53 And this example, if any of these three variables contains an empty string, 3:56 then the entire condition is true. 4:00