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szabgab · Jun 30, 2021 · 7fe1afe · 7fe1afe
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Showing 8 changed files with 43 additions and 2 deletions.
diff --git a/crystal/examples/strings/tr.cr b/crystal/examples/strings/tr.cr
@@ -0,0 +1 @@
+puts "abcdeabcde".tr("ab", "xy")
diff --git a/crystal/examples/strings/tr.out b/crystal/examples/strings/tr.out
@@ -0,0 +1 @@
+xycdexycde
diff --git a/crystal/examples/struct/integers.cr b/crystal/examples/struct/integers.cr
@@ -0,0 +1,13 @@
+struct Int
+  def prime?
+    (2..(self ** 0.5).to_i).each { |num|
+      return false if self % num == 0
+    }
+    return true
+  end
+end
+
+puts 23.odd?
+puts 23.even?
+puts 23.prime?
+puts 20.prime?
diff --git a/crystal/examples/time/add_timespan.cr b/crystal/examples/time/add_timespan.cr
@@ -2,3 +2,8 @@ now = Time.utc
 tomorrow = now + Time::Span.new(days: 1)
 puts now
 puts tomorrow
+
+puts now + 1.days
+puts now + 24.hours
+puts now + 1440.minutes
+puts now + 86_400.seconds
diff --git a/crystal/examples/time/add_timespan.out b/crystal/examples/time/add_timespan.out
@@ -1,2 +1,6 @@
-2021-06-11 10:06:03 UTC
-2021-06-12 10:06:03 UTC
+2021-06-29 14:31:14 UTC
+2021-06-30 14:31:14 UTC
+2021-06-30 14:31:14 UTC
+2021-06-30 14:31:14 UTC
+2021-06-30 14:31:14 UTC
+2021-06-30 14:31:14 UTC
diff --git a/crystal/strings.md b/crystal/strings.md
@@ -105,3 +105,9 @@
 
 ![](examples/strings/split_string.cr)
 
+## String Transliteration
+{id: string-transliteration}
+{i: tr}
+
+![](examples/strings/tr.cr)
+
diff --git a/crystal/structs.md b/crystal/structs.md
@@ -14,3 +14,8 @@
 
 ![](examples/struct/struct_with_initializer.cr)
 
+## Extend other structs
+{id: extend-other-structs}
+
+![](examples/struct/integers.cr)
+
diff --git a/crystal/time.md b/crystal/time.md
@@ -54,10 +54,16 @@
 
 ## Add timespan
 {id: add-timespan}
+{i: days}
+{i: hours}
+{i: minutes}
+{i: seconds}
 
 ![](examples/time/add_timespan.cr)
 ![](examples/time/add_timespan.out)
 
+* See these methods at [Int](https://crystal-lang.org/api/Int.html)
+
 ## Time Types
 {id: time-types}