one repo to rule them all

.idea/.gitignore

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+# Default ignored files
+/shelf/
+/workspace.xml
+# Editor-based HTTP Client requests
+/httpRequests/

.idea/codeStyles/codeStyleConfig.xml

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+<component name="ProjectCodeStyleConfiguration">
+  <state>
+    <option name="PREFERRED_PROJECT_CODE_STYLE" value="Default" />
+  </state>
+</component>

.idea/codecademy.iml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module type="WEB_MODULE" version="4">
+  <component name="NewModuleRootManager">
+    <content url="file://$MODULE_DIR$">
+      <excludeFolder url="file://$MODULE_DIR$/.tmp" />
+      <excludeFolder url="file://$MODULE_DIR$/temp" />
+      <excludeFolder url="file://$MODULE_DIR$/tmp" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

.idea/inspectionProfiles/Project_Default.xml

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+<component name="InspectionProjectProfileManager">
+  <profile version="1.0">
+    <option name="myName" value="Project Default" />
+    <inspection_tool class="SpellCheckingInspection" enabled="true" level="TYPO" enabled_by_default="true">
+      <option name="processCode" value="false" />
+      <option name="processLiterals" value="true" />
+      <option name="processComments" value="true" />
+    </inspection_tool>
+  </profile>
+</component>

.idea/modules.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/codecademy.iml" filepath="$PROJECT_DIR$/.idea/codecademy.iml" />
+    </modules>
+  </component>
+</project>

.idea/vcs.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$/credit-card-checker" vcs="Git" />
+    <mapping directory="$PROJECT_DIR$/mysterious-organism" vcs="Git" />
+  </component>
+</project>

credit-card-checker

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+Subproject commit ce5ec631b235224288aa67597f005daeeaa7889a

mysterious-organism/main.js

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+// Returns a random DNA base
+const returnRandBase = () => {
+  const dnaBases = ['A', 'T', 'C', 'G']
+  return dnaBases[Math.floor(Math.random() * 4)]
+}
+
+// Returns a random single stand of DNA containing 15 bases
+const mockUpStrand = () => {
+  const newStrand = []
+  for (let i = 0; i < 15; i++) {
+    newStrand.push(returnRandBase())
+  }
+  return newStrand
+}
+
+const pAequorFactory = function (id, DNA) {
+  return {
+    specimenNum: id,
+    dna: DNA,
+
+    mutate() {
+      const baseToChange = Math.floor(Math.random() * this.dna.length)
+      let mutation
+
+      do {
+        mutation = returnRandBase()
+      } while (mutation === this.dna[baseToChange])
+
+      this.dna[baseToChange] = mutation
+    },
+
+    compareDNA(other) {
+      let common = 0
+
+      for (let i = 0; i < this.dna.length; i++) {
+        if (this.dna[i] === other.dna[i]) {
+          common++
+        }
+      }
+
+      const percentage = (common / this.dna.length) * 100
+      console.log(`Specimen #${this.specimenNum} and specimen` +
+        ` #${other.specimenNum} have ${percentage}% DNA in common`)
+    },
+
+    willLikelySurvive() {
+      let goodBases = 0
+
+      this.dna.forEach((base) => {
+        if (base === 'C' || base === 'G') {
+          goodBases++
+        }
+      })
+
+      return (goodBases / this.dna.length) >= 0.6
+    },
+  }
+}
+
+let samples = []
+let id = 1
+
+while (samples.length < 30) {
+  samples.push(pAequorFactory(id, mockUpStrand()))
+  id++
+}
+
+samples.forEach((sample) => {
+  while (!sample.willLikelySurvive()) {
+    sample.mutate()
+  }
+
+  console.log(sample.specimenNum, sample.dna, sample.willLikelySurvive())
+})