TypeScript - Leap Complete

typescript/leap/README.md

@@ -0,0 +1,59 @@
+# Leap
+
+Given a year, report if it is a leap year.
+
+The tricky thing here is that a leap year in the Gregorian calendar occurs:
+
+```plain
+on every year that is evenly divisible by 4
+  except every year that is evenly divisible by 100
+    unless the year is also evenly divisible by 400
+```
+
+For example, 1997 is not a leap year, but 1996 is.  1900 is not a leap
+year, but 2000 is.
+
+If your language provides a method in the standard library that does
+this look-up, pretend it doesn't exist and implement it yourself.
+
+## Notes
+
+Though our exercise adopts some very simple rules, there is more to
+learn!
+
+For a delightful, four minute explanation of the whole leap year
+phenomenon, go watch [this youtube video][video].
+
+[video]: http://www.youtube.com/watch?v=xX96xng7sAE
+
+## Setup
+
+Go through the setup instructions for TypeScript to
+install the necessary dependencies:
+
+http://exercism.io/languages/typescript
+
+## Requirements
+
+Install assignment dependencies:
+
+```bash
+$ yarn install
+```
+
+## Making the test suite pass
+
+Execute the tests with:
+
+```bash
+$ yarn test
+```
+
+
+
+## Source
+
+JavaRanch Cattle Drive, exercise 3 [http://www.javaranch.com/leap.jsp](http://www.javaranch.com/leap.jsp)
+
+## Submitting Incomplete Solutions
+It's possible to submit an incomplete solution so you can see how others have completed the exercise.

typescript/leap/leap.test.ts

@@ -0,0 +1,39 @@
+import isLeapYear from './leap'
+
+describe('A leap year', () => {
+
+  it('is not very common', () => {
+    expect(isLeapYear(2015)).toBeFalsy()
+  })
+
+  it('is introduced every 4 years to adjust about a day', () => {
+    expect(isLeapYear(2016)).toBeTruthy()
+  })
+
+  it('is skipped every 100 years to remove an extra day', () => {
+    expect(isLeapYear(1900)).toBeFalsy()
+  })
+
+  it('is reintroduced every 400 years to adjust another day', () => {
+    expect(isLeapYear(2000)).toBeTruthy()
+  })
+
+  describe('Additional example of a leap year that', () => {
+
+    it('is not a leap year', () => {
+      expect(isLeapYear(1978)).toBeFalsy()
+    })
+
+    it('is a common leap year', () => {
+      expect(isLeapYear(1992)).toBeTruthy()
+    })
+
+    it('is skipped every 100 years', () => {
+      expect(isLeapYear(2100)).toBeFalsy()
+    })
+
+    it('is reintroduced every 400 years', () => {
+      expect(isLeapYear(2400)).toBeTruthy()
+    })
+  })
+})

typescript/leap/leap.ts

@@ -0,0 +1,14 @@
+function isLeapYear(year: number): boolean {
+    if (year % 4 == 0) {
+        if (year % 100 == 0) {
+            if (year % 400 == 0) {
+                return true
+            }
+            return false
+        }
+        return true
+    }
+    return false
+}
+
+export default isLeapYear

typescript/leap/package.json

@@ -0,0 +1,36 @@
+{
+  "name": "xtypescript",
+  "version": "0",
+  "description": "Exercism exercises in Typescript.",
+  "author": "",
+  "private": true,
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/exercism/xtypescript"
+  },
+  "devDependencies": {},
+  "scripts": {
+    "test": "tsc --noEmit -p . && jest --no-cache",
+    "lint": "tsc --noEmit -p . && tslint \"*.ts?(x)\"",
+    "lintci": "tslint \"*.ts?(x)\" --force"
+  },
+  "dependencies": {
+    "@types/jest": "^20.0.0",
+    "@types/node": "^7.0.5",
+    "jest": "^20.0.4",
+    "ts-jest": "^20.0.6",
+    "tslint": "^5.4.3",
+    "typescript": "^2.2.1"
+  },
+  "jest": {
+    "transform": {
+      ".(ts|tsx)": "<rootDir>/node_modules/ts-jest/preprocessor.js"
+    },
+    "testRegex": "(/__tests__/.*|\\.(test|spec))\\.(ts|tsx|js)$",
+    "moduleFileExtensions": [
+      "ts",
+      "tsx",
+      "js"
+    ]
+  }
+}

typescript/leap/tsconfig.json

@@ -0,0 +1,22 @@
+{
+    "compilerOptions": { 
+        "target": "es2017",
+        "module": "commonjs",
+        "alwaysStrict": true,
+        "noUnusedLocals": true,
+        "noUnusedParameters": true,
+        "noImplicitAny": true,
+        "strictNullChecks": true,
+        "preserveConstEnums": true,
+        "noFallthroughCasesInSwitch":true,
+        "noImplicitThis":true,
+        "noImplicitReturns":true,
+        "sourceMap": true,
+        "noEmitOnError": true,
+        "outDir": "./build"
+    },
+    "compileOnSave": true, 
+    "exclude": [
+        "node_modules"
+    ]
+}

typescript/leap/tslint.json

@@ -0,0 +1,127 @@
+{
+    "jsRules": {
+        "class-name": true,
+        "comment-format": [
+            true,
+            "check-space"
+        ],
+        "indent": [
+            true,
+            "spaces"
+        ],
+        "no-duplicate-variable": true,
+        "no-eval": true,
+        "no-trailing-whitespace": true,
+        "no-unsafe-finally": true,
+        "one-line": [
+            true,
+            "check-open-brace",
+            "check-whitespace"
+        ],
+        "quotemark": [
+            false,
+            "double"
+        ],
+        "semicolon": [
+            true,
+            "never"
+        ],
+        "triple-equals": [
+            true,
+            "allow-null-check"
+        ],
+        "variable-name": [
+            true,
+            "ban-keywords"
+        ],
+        "whitespace": [
+            true,
+            "check-branch",
+            "check-decl",
+            "check-operator",
+            "check-separator",
+            "check-type"
+        ]
+    },
+    "rules": {
+        "class-name": true,
+        "comment-format": [
+            true,
+            "check-space"
+        ],
+        "indent": [
+            true,
+            "spaces"
+        ],
+        "no-eval": true,
+        "no-internal-module": true,
+        "no-trailing-whitespace": true,
+        "no-unsafe-finally": true,
+        "no-var-keyword": true,
+        "one-line": [
+            true,
+            "check-open-brace",
+            "check-whitespace"
+        ],
+        "semicolon": [
+            true,
+            "never"
+        ],
+        "triple-equals": [
+            true,
+            "allow-null-check"
+        ],
+        "typedef-whitespace": [
+            true,
+            {
+                "call-signature": "nospace",
+                "index-signature": "nospace",
+                "parameter": "nospace",
+                "property-declaration": "nospace",
+                "variable-declaration": "nospace"
+            }
+        ],
+        "variable-name": [
+            true,
+            "ban-keywords"
+        ],
+        "whitespace": [
+            true,
+            "check-branch",
+            "check-decl",
+            "check-operator",
+            "check-separator",
+            "check-type"
+        ],
+        "no-namespace": true, 
+        "prefer-for-of": true,
+        "only-arrow-functions": [true, "allow-declarations"],
+        "no-var-requires": true,
+        "no-any": true,
+        "curly": true,
+        "forin": true,
+        "no-arg": true,
+        "label-position": true,
+        "no-conditional-assignment": true,
+        "no-console": [true, "log", "error"],
+        "no-construct": true,
+        "no-duplicate-variable": true,
+        "no-empty": true,
+        "no-invalid-this": [true, "check-function-in-method"],
+        "no-misused-new": true,
+        "no-null-keyword": true,
+        "no-string-literal": true,
+        "radix": true,
+        "typeof-compare": true,
+        "use-isnan": true,
+        "prefer-const": true,
+        "array-type": [true, "array-simple"],
+        "arrow-parens": true,
+        "new-parens": true,
+        "no-consecutive-blank-lines": [true,1],
+        "no-parameter-properties": true,
+        "no-unnecessary-initializer": true,
+        "object-literal-shorthand": true,
+        "object-literal-key-quotes": [true, "as-needed"]
+    }
+}