| 1 | func __math_select(list, cmp) {
|
| 2 | ## Internal helper for `max` and `min`.
|
| 3 | ##
|
| 4 | ## NOTE: If `list` is empty, then an error is thrown.
|
| 5 |
|
| 6 | if (len(list) === 0) {
|
| 7 | error "Unexpected empty list" (status=3)
|
| 8 | }
|
| 9 |
|
| 10 | if (len(list) === 1) {
|
| 11 | return (list[0])
|
| 12 | }
|
| 13 |
|
| 14 | var match = list[0]
|
| 15 | for i in (1 .. len(list)) {
|
| 16 | setvar match = cmp(list[i], match)
|
| 17 | }
|
| 18 | return (match)
|
| 19 | }
|
| 20 |
|
| 21 | func max(...args) {
|
| 22 | ## Compute the maximum of 2 or more values.
|
| 23 | ##
|
| 24 | ## `max` takes two different signatures:
|
| 25 | ## - `max(a, b)` to return the maximum of `a`, `b`
|
| 26 | ## - `max(list)` to return the greatest item in the `list`
|
| 27 | ##
|
| 28 | ## So, for example:
|
| 29 | ##
|
| 30 | ## max(1, 2) # => 2
|
| 31 | ## max([1, 2, 3]) # => 3
|
| 32 |
|
| 33 | case (len(args)) {
|
| 34 | (1) { return (__math_select(args[0], max)) }
|
| 35 | (2) {
|
| 36 | if (args[0] > args[1]) {
|
| 37 | return (args[0])
|
| 38 | } else {
|
| 39 | return (args[1])
|
| 40 | }
|
| 41 | }
|
| 42 | (else) { error "max expects 1 or 2 args" (status=3) }
|
| 43 | }
|
| 44 | }
|
| 45 |
|
| 46 | func min(...args) {
|
| 47 | ## Compute the minimum of 2 or more values.
|
| 48 | ##
|
| 49 | ## `min` takes two different signatures:
|
| 50 | ## - `min(a, b)` to return the minimum of `a`, `b`
|
| 51 | ## - `min(list)` to return the least item in the `list`
|
| 52 | ##
|
| 53 | ## So, for example:
|
| 54 | ##
|
| 55 | ## min(2, 3) # => 2
|
| 56 | ## max([1, 2, 3]) # => 1
|
| 57 |
|
| 58 | case (len(args)) {
|
| 59 | (1) { return (__math_select(args[0], min)) }
|
| 60 | (2) {
|
| 61 | if (args[0] < args[1]) {
|
| 62 | return (args[0])
|
| 63 | } else {
|
| 64 | return (args[1])
|
| 65 | }
|
| 66 | }
|
| 67 | (else) { error "min expects 1 or 2 args" (status=3) }
|
| 68 | }
|
| 69 | }
|
| 70 |
|
| 71 | func abs(x) {
|
| 72 | ## Compute the absolute (positive) value of a number (float or int).
|
| 73 |
|
| 74 | if (x < 0) {
|
| 75 | return (-x)
|
| 76 | } else {
|
| 77 | return (x)
|
| 78 | }
|
| 79 | }
|