freecode camp solutions added

Author: mzb2599

freecodecamp/arrowFunction.js

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+/*
+Rewrite the function assigned to the variable magic which returns a new Date() to use arrow function syntax.
+ Also, make sure nothing is defined using the keyword var.
+*/
+
+/*var magic = function() {
+ return new Date();
+};*/
+
+const magic = () => {
+ return new Date();
+};

freecodecamp/concatArrowFunction.js

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+//Rewrite the myConcat function which appends contents of arr2 to arr1 so that the function uses arrow function syntax.
+
+// var myConcat = function(arr1, arr2) {
+// return arr1.concat(arr2);
+// };
+
+const myConcat = (arr1, arr2) => {
+ return arr1.concat(arr2);
+};
+
+console.log(myConcat([1, 2], [3, 4, 5]));

freecodecamp/defaultParameters.js

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+//Set Default Parameters for Your Functions
+//Modify the function increment by adding default parameters so that it will add 1 to number if value is not specified.
+
+// Only change code below this line
+const increment = (number, value = 1) => number + value;
+// Only change code above this line

freecodecamp/freezeObject.js

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+//
+function freezeObj() {
+ const MATH_CONSTANTS = {
+ PI: 3.14,
+ };
+ // Only change code below this line
+ Object.freeze(MATH_CONSTANTS);
+
+ // Only change code above this line
+ try {
+ //Below line will not affect the code as the object is freezed
+ MATH_CONSTANTS.PI = 99;
+ } catch (ex) {
+ console.log(ex);
+ }
+ return MATH_CONSTANTS.PI;
+}
+
+const PI = freezeObj();
+console.log(PI);

freecodecamp/mutateArray.js

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+//An array is declared as const s = [5, 7, 2]. Change the array to [2, 5, 7] using various element assignments.
+const s = [5, 7, 2];
+function editInPlace() {
+ // Only change code below this line
+
+ // Using s = [2, 5, 7] would be invalid
+ var l = s.length;
+ var t = s[l - 1];
+ for (var i = 0; i < l; i++) {
+ s[l - i - 1] = s[l - i - 2];
+ }
+ s[0] = t;
+ // Only change code above this line
+}
+editInPlace();
+console.log(s);

freecodecamp/scope.js

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+//Block scope and function scope
+function checkScope() {
+ let i = "function scope";
+ if (true) {
+ let i = "block scope";
+ console.log("Block scope i is: ", i);
+ }
+ console.log("Function scope i is: ", i);
+ return i;
+}
+checkScope();
+
+/*Output
+D:\Code\js\Javascript\freecodecamp>node scope.js
+Block scope i is: block scope
+Function scope i is: function scope
+*/