answers

branches.txt

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+  origin/CHALLENGE/1-1/let-var-const/finish
+  origin/CHALLENGE/1-1/let-var-const/start
+  origin/CHALLENGE/1-2/closures/finish
+  origin/CHALLENGE/1-2/closures/start
+  origin/CHALLENGE/1-3/variable-lifecycles/finish
+  origin/CHALLENGE/1-3/variable-lifecycles/start
+  origin/CHALLENGE/2-1/regular-vs-arrow-functions/finish
+  origin/CHALLENGE/2-1/regular-vs-arrow-functions/start
+  origin/CHALLENGE/3-1/foreach-with-index/finish
+  origin/CHALLENGE/3-1/foreach-with-index/start
+  origin/CHALLENGE/3-10/reduce-to-object/finish
+  origin/CHALLENGE/3-10/reduce-to-object/start
+  origin/CHALLENGE/3-11/sort-array-of-objects/finish
+  origin/CHALLENGE/3-11/sort-array-of-objects/start
+  origin/CHALLENGE/3-12/sort-long-array-of-objects/finish
+  origin/CHALLENGE/3-12/sort-long-array-of-objects/start
+  origin/CHALLENGE/3-2/map-json-to-object/finish
+  origin/CHALLENGE/3-2/map-json-to-object/start
+  origin/CHALLENGE/3-3/find-single-post/finish
+  origin/CHALLENGE/3-3/find-single-post/start
+  origin/CHALLENGE/3-4/is-array-sorted-or-not/finish
+  origin/CHALLENGE/3-4/is-array-sorted-or-not/start
+  origin/CHALLENGE/3-5/compare-two-arrays/finish
+  origin/CHALLENGE/3-5/compare-two-arrays/start
+  origin/CHALLENGE/3-6/element-is-in-array/finish
+  origin/CHALLENGE/3-6/element-is-in-array/start
+  origin/CHALLENGE/3-7/includes-object-or-array/finish
+  origin/CHALLENGE/3-7/includes-object-or-array/start
+  origin/CHALLENGE/3-8/push-to-array-if-not-exists/finish
+  origin/CHALLENGE/3-8/push-to-array-if-not-exists/start
+  origin/CHALLENGE/3-9/reduce-array-of-objects/finish
+  origin/CHALLENGE/3-9/reduce-array-of-objects/start
+  origin/CHALLENGE/4-1/template-literals/finish
+  origin/CHALLENGE/4-1/template-literals/start
+  origin/CHALLENGE/4-2/default-tagged-template/finish
+  origin/CHALLENGE/4-2/default-tagged-template/start
+  origin/CHALLENGE/5-1/rest-and-spread-operators/finish
+  origin/CHALLENGE/5-1/rest-and-spread-operators/start
+  origin/CHALLENGE/5-2/default-value-without-default-parameters/finish
+  origin/CHALLENGE/5-2/default-value-without-default-parameters/start
+  origin/CHALLENGE/5-3/generate-missing-unique-ids/finish
+  origin/CHALLENGE/5-3/generate-missing-unique-ids/start
+  origin/CHALLENGE/6-1/enhanced-object-literals/finish
+  origin/CHALLENGE/6-1/enhanced-object-literals/start
+  origin/CHALLENGE/6-2/array-destructuring/finish
+  origin/CHALLENGE/6-2/array-destructuring/start
+  origin/CHALLENGE/6-3/destructure-result-of-the-function/finish
+  origin/CHALLENGE/6-3/destructure-result-of-the-function/start
+  origin/CHALLENGE/6-4/object-destructuring/finish
+  origin/CHALLENGE/6-4/object-destructuring/start
+  origin/CHALLENGE/6-5/object-destructuring-and-array-helper-methods/finish
+  origin/CHALLENGE/6-5/object-destructuring-and-array-helper-methods/start
+  origin/CHALLENGE/6-6/delete-object-properties/finish
+  origin/CHALLENGE/6-6/delete-object-properties/start
+  origin/CHALLENGE/7-1/insert-prototype-to-existing-chain/finish
+  origin/CHALLENGE/7-1/insert-prototype-to-existing-chain/start
+  origin/CHALLENGE/7-2/fix-mistakes-in-function-constructors/finish
+  origin/CHALLENGE/7-2/fix-mistakes-in-function-constructors/start
+  origin/CHALLENGE/7-3/convert-function-constructors-to-classes/finish
+  origin/CHALLENGE/7-3/convert-function-constructors-to-classes/start
+  origin/CHALLENGE/7-4/extend-array/finish
+  origin/CHALLENGE/7-4/extend-array/start
+  origin/CHALLENGE/7-5/custom-push-method-for-arrays/finish
+  origin/CHALLENGE/7-5/custom-push-method-for-arrays/start
+  origin/CHALLENGE/7-6/classes-in-react-additional-button/finish
+  origin/CHALLENGE/7-6/classes-in-react-additional-button/start
+  origin/HEAD -> origin/master
+  origin/LECTURES/01-var
+  origin/LECTURES/02-scopes
+  origin/LECTURES/03-let
+  origin/LECTURES/04-const
+  origin/LECTURES/05-variables-usage-guidelines
+  origin/LECTURES/06-var-let-or-const
+  origin/LECTURES/07-var-lifecycle
+  origin/LECTURES/08-undecleared-variable-lifecycle
+  origin/LECTURES/09-let-lifecycle
+  origin/LECTURES/10-const-lifecycle
+  origin/LECTURES/11-function-lifecycle
+  origin/LECTURES/12-compilation-and-execution-demo/finish
+  origin/LECTURES/12-compilation-and-execution-demo/start
+  origin/LECTURES/13-functions-overview
+  origin/LECTURES/14-arrow-functions-syntax
+  origin/LECTURES/15-arrow-functions-examples
+  origin/LECTURES/16-arrow-functions-this-keyword
+  origin/LECTURES/17-regular-instead-of-arrow-functions
+  origin/LECTURES/18-arguments-in-the-functions
+  origin/LECTURES/19-foreach
+  origin/LECTURES/20-map
+  origin/LECTURES/21-filter
+  origin/LECTURES/22-find
+  origin/LECTURES/23-every-and-some
+  origin/LECTURES/24-includes
+  origin/LECTURES/25-reduce
+  origin/LECTURES/26-sort
+  origin/LECTURES/27-template-literals
+  origin/LECTURES/28-tagged-templates
+  origin/LECTURES/29-rest-parameters
+  origin/LECTURES/30-spread-operator
+  origin/LECTURES/31-default-function-parameters
+  origin/LECTURES/32-enhanced-object-literals
+  origin/LECTURES/33-array-destructuring
+  origin/LECTURES/34-object-destructuring
+  origin/LECTURES/35-function-constructors
+  origin/LECTURES/36-object-create
+  origin/LECTURES/37-classes
+  origin/LECTURES/38-classes-in-react
+  origin/master
+
+git checkout --track  origin/CHALLENGE/1-1/let-var-const/start
+

index.js

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+/**
+ * CHALLENGE 1-1 TASK
+ *
+ * Rewrite code below using let, const and var according to
+ * variables usage guidelines
+ */
+"use strict";
+
+const numbers1 = [23, 87, 110, 11, 20, 5, 34];
+const numbers2 = [11, 21, 31];
+
+const onlyOddNumbers = function(arr) {
+    var oddNumbers = [];
+    var evenNumberQty = 0;
+    const LEN = arr.length;
+
+    for (let i = 0; i < LEN; i++) {
+        arr[i] % 2 ?
+            oddNumbers.push(arr[i]) :
+            evenNumberQty++;
+    }
+
+    var info;
+    if (evenNumberQty === 0) {
+        let info = "Array contains only odd numbers";
+        console.log(info);
+    } else {
+        let info =
+            "There are " +
+            evenNumberQty +
+            " even numbers";
+        console.log(info);
+    }
+
+    return {
+        oddNumbers: oddNumbers,
+        evenNumberQty: evenNumberQty
+    };
+
+};
+
+console.log(onlyOddNumbers(numbers1));
+console.log(onlyOddNumbers(numbers2));