feat: more questions var const scope

Author: JulienDemarque

.eslintrc.json

@@ -32,6 +32,11 @@
     "react/jsx-curly-brace-presence": "off",
     "no-unused-expressions": 0,
     "chai-friendly/no-unused-expressions": "off",
-    "eqeqeq": "off"
+    "eqeqeq": "off",
+    "no-var": 0,
+    "vars-on-top": "off",
+    "no-plusplus": "off",
+    "block-scoped-var": "off",
+    "no-use-before-define": "off"
   }
 }

data/javascript/boolean-explicit-type-conversion/question.js

@@ -1,3 +1,3 @@
-// What will console.log from the following code;
+// What will console.log from the following code:
 
 console.log(Boolean(null), Boolean(' '), Boolean('0'), Boolean('false'));

data/javascript/comparison-operator/question.js

@@ -1,3 +1,3 @@
-// What will console.log from the following code;
+// What will console.log from the following code:
 
 console.log('B' < 'b', '01' == 1, false == '0', '' == 0);

data/javascript/const-keyword-continued/index.json

@@ -0,0 +1,22 @@
+{
+  "title": "Const Keyword Continued",
+  "key": "const-keyword-continued",
+  "description": "Const keyword assigned an object",
+  "difficulty": 2,
+  "explanation": "const keyword is used to declare a constant. Objects are not immutable though, the value of the const hasn't change because the object was mutated, the constant still points to the same object.",
+  "correctAnswer": "'world'",
+  "answers": [
+    {
+      "answer": "Uncaught ReferenceError: foo is not defined"
+    },
+    {
+      "answer": "'hello'"
+    },
+    {
+      "answer": "'world'"
+    },
+    {
+      "answer": "Uncaught TypeError: Assignment to constant variable."
+    }
+  ]
+}

data/javascript/const-keyword-continued/question.js

@@ -0,0 +1,5 @@
+// What will console.log from the following code:
+
+const foo = { bar: 'hello' };
+foo.bar = 'world';
+console.log(foo.bar);

data/javascript/const-keyword/index.json

@@ -0,0 +1,22 @@
+{
+  "title": "Const Keyword",
+  "key": "const-keyword",
+  "description": "Const Keyword",
+  "difficulty": 2,
+  "explanation": "const keyword is used to declare a constant, it can't be initiated without a value. It can't be reassigned a different value.",
+  "correctAnswer": "Uncaught TypeError: Assignment to constant variable.",
+  "answers": [
+    {
+      "answer": "Uncaught ReferenceError: foo is not defined"
+    },
+    {
+      "answer": "5"
+    },
+    {
+      "answer": "'hello'"
+    },
+    {
+      "answer": "Uncaught TypeError: Assignment to constant variable."
+    }
+  ]
+}

data/javascript/const-keyword/question.js

@@ -0,0 +1,5 @@
+// What will console.log from the following code:
+
+const foo = 5;
+foo = 'hello'; // eslint-disable-line
+console.log(foo);

data/javascript/index.json

@@ -24,6 +24,22 @@
     {
       "title": "Comparison Operator",
       "key": "comparison-operator"
+    },
+    {
+      "title": "Let Variable",
+      "key": "let-variable"
+    },
+    {
+      "title": "Const Keyword",
+      "key": "const-keyword"
+    },
+    {
+      "title": "Const Keyword Continued",
+      "key": "const-keyword-continued"
+    },
+    {
+      "title": "Scope Var",
+      "key": "scope-var"
     }
   ]
 }

data/javascript/let-variable/index.json

@@ -0,0 +1,22 @@
+{
+  "title": "Let Variable",
+  "key": "let-variable",
+  "description": "Let Variable",
+  "difficulty": 1,
+  "explanation": "let keyword is used to declare a variable, it is initiated with a value of undefined. it allows you to change the value of the variable.",
+  "correctAnswer": "undefined 'fuzz'",
+  "answers": [
+    {
+      "answer": "Uncaught ReferenceError: foo is not defined"
+    },
+    {
+      "answer": "undefined 'fuzz'"
+    },
+    {
+      "answer": "undefined 6"
+    },
+    {
+      "answer": "null 'fuzz'"
+    }
+  ]
+}

data/javascript/let-variable/question.js

@@ -0,0 +1,6 @@
+// What will console.log from the following code;
+
+let foo;
+let bar = 6;
+bar = 'fuzz';
+console.log(foo, bar);

data/javascript/minus-operator-coercion/question.js

@@ -1,3 +1,3 @@
-// What will console.log from the following code;
+// What will console.log from the following code:
 
 console.log(true - false, 2 - 'foo', '3' - 1);

data/javascript/number-explicit-type-conversion/question.js

@@ -1,3 +1,3 @@
-// What will console.log from the following code;
+// What will console.log from the following code:
 
 console.log(Number('5'), Number('undefined'), typeof Number('foo'));

data/javascript/scope-var/index.json

@@ -0,0 +1,22 @@
+{
+  "title": "Scope Var",
+  "key": "scope-var",
+  "description": "Understand the var keyword scoping",
+  "difficulty": 3,
+  "explanation": "var is scoped to functions but is not block scoped, like in a for loop.",
+  "correctAnswer": "5 4 undefined",
+  "answers": [
+    {
+      "answer": "undefined 4 undefined"
+    },
+    {
+      "answer": "5 4 undefined"
+    },
+    {
+      "answer": "Uncaught ReferenceError: baz is not defined"
+    },
+    {
+      "answer": "4 4 undefined"
+    }
+  ]
+}

data/javascript/scope-var/question.js

@@ -0,0 +1,8 @@
+// What will console.log from the following code;
+
+var bar;
+for (var foo = 0; foo < 5; foo++) {
+  bar = foo;
+}
+console.log(foo, bar, baz);
+var baz = 10;

data/javascript/simple-add/question.js

@@ -1,4 +1,4 @@
-// What will console.log from the following code;
-const simpleAdd = (a, b) => a + b;
+// What will console.log from the following code:
 
+const simpleAdd = (a, b) => a + b;
 console.log(simpleAdd(2, 3));