03-objects-arrays-intro-to-testing

03-objects-arrays-intro-to-testing/1-create-getter/index.js

@@ -4,5 +4,13 @@
  * @returns {function} - function-getter which allow get value from object by set path
  */
 export function createGetter(path) {
-
+  const fields = path.split('.');
+  return function (product) {
+    return fields.reduce((acc, key) => {
+      if (acc && product.hasOwnProperty.call(acc, key)) {
+        return acc[key];
+      }
+      return undefined;
+    }, product);
+  };
 }

03-objects-arrays-intro-to-testing/2-invert-object/index.js

@@ -4,5 +4,12 @@
  * @returns {object | undefined} - returns new object or undefined if nothing did't pass
  */
 export function invertObj(obj) {
-
+  if (!obj) {
+    return undefined;
+  }
+  const newObj = {};
+  Object.entries(obj).reduce((acc, [key, value]) => {
+    return newObj[value] = key;
+  }, {});
+  return newObj;
 }

03-objects-arrays-intro-to-testing/3-trim-symbols/index.js

@@ -5,5 +5,22 @@
  * @returns {string} - the new string without extra symbols according passed size
  */
 export function trimSymbols(string, size) {
+  if (size === undefined) {return string;}
+  if (size === 0) {return '';}
+  let result = '';
+  let count = 1;
 
+  for (let i = 0; i < string.length; i++) {
+    if (string[i] === string[i - 1]) {
+      count++;
+    } else {
+      count = 1;
+    }
+
+    if (count <= size) {
+      result += string[i];
+    }
+  }
+
+  return result;
 }

03-objects-arrays-intro-to-testing/4-uniq/index.js

@@ -4,5 +4,5 @@
  * @returns {*[]} - the new array with uniq values
  */
 export function uniq(arr) {
-
+  return Array.from(new Set(arr));
 }