Code challange 9

challanges/code-challange-4/.eslintrc.json

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+{
+    "globals" : {
+      "Handlebars": true,
+      "$": true
+    },
+    "extends": "eslint:recommended",
+    "parserOptions": {
+      "ecmaVersion": 6
+    },
+    "env": {
+      "browser": true,
+      "jquery": true,
+      "node": true,
+      "es6": true,
+      "jest": true
+    },
+    "rules": {
+      "eqeqeq": ["error", "always"],
+      "no-template-curly-in-string": "error",
+      "no-console": "off",
+      "no-undefined": "off",
+      "indent": ["error", 2],
+      "quotes": ["warn", "single", {"allowTemplateLiterals": true}],
+      "no-multi-spaces": ["warn", {"exceptions": { "VariableDeclarator": true }}],
+      "no-trailing-spaces": "warn",
+      "new-cap": "warn",
+      "no-redeclare": ["error", { "builtinGlobals": true }],
+      "eol-last": "error"
+    }
+  }

challanges/code-challange-4/__test__/code-challange4.test.js

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+'use strict';
+
+let validator = require('../code-challange4.js');
+describe('Fibonacci Module',()=>{
+  it('validate  the output arr  ' ,()=> {
+    expect(validator(8)).toEqual( 21 )
+  });
+})

challanges/code-challange-4/code-challange4.js

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+'use strict';
+function fibFunction(x){
+  let array = [0, 1];
+  for (let i = array.length; i < x + 1; i++){
+    let sum = array[i - 2] + array[i -1];
+    array.push(sum)
+  }
+  return array[x]
+}
+
+module.exports = fibFunction ;