[JS][7kyu] Who let the dogs out?

codewars/7kyu/who-let-the-dogs-out/koronya.js

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+// [JS][7kyu] Who let the dogs out?
+// who-let-the-dogs-out
+// https://www.codewars.com/kata/5434d8487abffa2f64000db6/train/javascript
+
+const BARK = 'woof woof'
+const SLEEP = 'zzzzzzzzz....'
+
+const dog_bark_by_default2 = (bark) => {
+  bark = bark || true
+  return bark ? BARK : SLEEP
+}
+
+const dog_bark_by_default = (bark) => {
+  bark = bark === undefined ? true : bark
+  return bark ? BARK : SLEEP
+}
+
+const dog_bark_only_if_told_so = (bark) => {
+  bark = bark || false
+  return bark ? BARK : SLEEP
+}
+
+const dog_dont_bark_by_default = (dont_bark) => {
+  dont_bark = dont_bark === undefined ? true : dont_bark
+  return !dont_bark ? BARK : SLEEP
+}
+
+const dog_dont_bark_only_if_told_so = (dont_bark) => {
+  dont_bark = dont_bark || false
+  return !dont_bark ? BARK : SLEEP
+}
+
+dog_bark_only_if_told_so(true) === BARK
+dog_bark_only_if_told_so(false) === SLEEP
+dog_bark_only_if_told_so() === SLEEP
+
+dog_dont_bark_only_if_told_so(true) === SLEEP
+dog_dont_bark_only_if_told_so(false) === BARK
+dog_dont_bark_only_if_told_so() === BARK
+
+dog_dont_bark_by_default() === SLEEP
+dog_dont_bark_by_default(false) === BARK
+
+dog_bark_by_default() === BARK
+dog_bark_by_default(false) === SLEEP