Created
August 18, 2020 17:02
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We’ve seen that % (the remainder operator) can be used to test whether a number is even or odd by using % 2 to see whether it’s divisible by two. Here’s another way to define whether a positive whole number is even or odd: Zero is even. One is odd. For any other number N, its evenness is the same as N - 2. Define a recursive function isEven corr…
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| // We’ve seen that % (the remainder operator) can be used to test whether | |
| // a number is even or odd by using % 2 to see whether it’s divisible by two. | |
| // Here’s another way to define whether a positive whole number is even or odd: | |
| // | |
| // Zero is even. | |
| // | |
| // One is odd. | |
| // | |
| // For any other number N, its evenness is the same as N - 2. | |
| // Define a recursive function isEven corresponding to this description. | |
| // The function should accept a single parameter (a positive, whole number) and return a Boolean. | |
| function isEven(number) { | |
| if (number === 0){ | |
| return true; | |
| } else if (number ===1) { | |
| return false; } | |
| else { | |
| return isEven(number-2) | |
| } | |
| } | |
| isEven(0) // true | |
| isEven(1) // false | |
| isEven(2) // true | |
| isEven(3) // false |
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