diff --git a/Exercises.ru.md b/Exercises.ru.md
new file mode 100644
index 0000000..038ef43
--- /dev/null
+++ b/Exercises.ru.md
@@ -0,0 +1,47 @@
+# Упражнения
+
+## Итерирование циклами
+
+Реализуйте функцию `sum(...args)`, которая суммирует все свои аргументы, пятью
+разными способами. Примеры вызовов с результатами:
+```js
+const a = sum(1, 2, 3) // a === 6
+const b = sum(0) // b === 0
+const c = sum() // c === 0
+const d = sum(1, -1, 1) // d === 1
+const e = sum(10, -1, -1, -1) // e === 7
+```
+
+1. Цикл `for`
+2. Цикл `for..of`
+3. Цикл `while`
+4. Цикл `do..while`
+5. Метод `Array.prototype.reduce()`
+
+## Итерирование по двумерному массиву
+
+6. Найдите максимальный элемент в двумерном массиве
+```js
+const m = max([[1, 2, 3], [4, 5, 6], [7, 8, 9]]);
+console.log(m); // 9
+```
+
+## Итерирование объектов-справочников
+
+7. При помощи цикла `for..in` перебрать объект-справочник с датами рождения и
+смерти людей и вернуть справочник с продолжительностью их жизни. Например:
+```js
+const persons = {
+ lenin: { born: 1870, died: 1924 },
+ mao: { born: 1893, died: 1976 },
+ gandhi: { born: 1869, died: 1948 },
+ hirohito: { born: 1901, died: 1989 },
+};
+console.log(ages(persons));
+// {
+// lenin: 54,
+// mao: 83,
+// gandhi: 79,
+// hirohito: 88,
+// }
+```
diff --git a/Exercises/1-for.js b/Exercises/1-for.js
index 62e6ab8..9c605a2 100644
--- a/Exercises/1-for.js
+++ b/Exercises/1-for.js
@@ -1,9 +1,12 @@
-'use strict';
+/* eslint-disable quotes */
+"use strict";
-const sum = (...args) => {
- // Use for loop and accumulator variable
- // to calculate sum of all given arguments
- // For example sum(1, 2, 3) should return 6
+const sum = args => {
+ let add = 0;
+ for (let i = 0; i < args.length; i++) {
+ add += Number(args[i]);
+ }
+ return add;
};
module.exports = { sum };
diff --git a/Exercises/2-for-of.js b/Exercises/2-for-of.js
index 9965f25..8853e1d 100644
--- a/Exercises/2-for-of.js
+++ b/Exercises/2-for-of.js
@@ -1,9 +1,13 @@
-'use strict';
+/* eslint-disable quotes */
+"use strict";
const sum = (...args) => {
- // Use for..of loop and accumulator variable
- // to calculate sum of all given arguments
- // For example sum(1, 2, 3) should return 6
+ let add = 0;
+ for (const i of args) {
+ add += i;
+ }
+ return add;
};
+
module.exports = { sum };
diff --git a/Exercises/3-while.js b/Exercises/3-while.js
index 6110b9f..1bb0485 100644
--- a/Exercises/3-while.js
+++ b/Exercises/3-while.js
@@ -1,9 +1,14 @@
'use strict';
const sum = (...args) => {
- // Use while loop and accumulator variable
- // to calculate sum of all given arguments
- // For example sum(1, 2, 3) should return 6
+ let add = 0;
+ let index = args.length - 1;
+ while (index >= 0) {
+ add += args[index];
+ args.pop();
+ index--;
+ }
+ return add;
};
module.exports = { sum };
diff --git a/Exercises/4-do-while.js b/Exercises/4-do-while.js
index 22d4464..e542ef0 100644
--- a/Exercises/4-do-while.js
+++ b/Exercises/4-do-while.js
@@ -1,9 +1,14 @@
-'use strict';
+// eslint-disable-next-line quotes
+"use strict";
const sum = (...args) => {
- // Use do..while loop and accumulator variable
- // to calculate sum of all given arguments
- // For example sum(1, 2, 3) should return 6
+ let add = 0;
+ let index = args.length - 1;
+ do {
+ add += args[index];
+ index--;
+ } while (index >= 0);
+ return add;
};
module.exports = { sum };
diff --git a/Exercises/5-reduce.js b/Exercises/5-reduce.js
index a9cb44c..6735d45 100644
--- a/Exercises/5-reduce.js
+++ b/Exercises/5-reduce.js
@@ -1,8 +1,5 @@
'use strict';
-const sum = (...args) => 0;
-// Use Array.prototype.reduce method
-// to calculate sum of all given arguments
-// For example sum(1, 2, 3) should return 6
+const sum = (...args) => args.reduce((acc, curr) => acc + curr, 0);
module.exports = { sum };
diff --git a/Exercises/6-matrix.js b/Exercises/6-matrix.js
new file mode 100644
index 0000000..6dc37b5
--- /dev/null
+++ b/Exercises/6-matrix.js
@@ -0,0 +1,12 @@
+'use strict';
+
+const max = matrix =>
+ []
+ .concat(
+ Array.isArray(matrix) ?
+ matrix.reduce((acc, cur) => acc.concat(max(cur)), []) :
+ matrix
+ )
+ .sort((a, b) => b - a)[0];
+
+module.exports = { max };
diff --git a/Exercises/6-matrix.test b/Exercises/6-matrix.test
new file mode 100644
index 0000000..aedfec3
--- /dev/null
+++ b/Exercises/6-matrix.test
@@ -0,0 +1,13 @@
+({
+ name: 'max',
+ length: [220, 300],
+ cases: [
+ [[[10]], 10],
+ [[[1, 2], [3, 4], [5, 6]], 6],
+ [[[-1, 1], [2, -1], [-1, 0]], 2],
+ ],
+ test: max => {
+ const src = max.toString();
+ if (!src.includes('for (')) throw new Error('Use for loop');
+ }
+})
diff --git a/Exercises/7-ages.js b/Exercises/7-ages.js
new file mode 100644
index 0000000..1760e8b
--- /dev/null
+++ b/Exercises/7-ages.js
@@ -0,0 +1,10 @@
+'use strict';
+
+const ages = persons => {
+ const lifeTime = {};
+ for (const key in persons)
+ lifeTime[key] = persons[key].died - persons[key].born;
+ return lifeTime;
+};
+
+module.exports = { ages };
diff --git a/Exercises/7-ages.test b/Exercises/7-ages.test
new file mode 100644
index 0000000..9802861
--- /dev/null
+++ b/Exercises/7-ages.test
@@ -0,0 +1,24 @@
+({
+ name: 'ages',
+ length: [150, 190],
+ cases: [
+ [
+ {
+ lenin: { born: 1870, died: 1924 },
+ mao: { born: 1893, died: 1976 },
+ gandhi: { born: 1869, died: 1948 },
+ hirohito: { born: 1901, died: 1989 },
+ }, {
+ lenin: 54,
+ mao: 83,
+ gandhi: 79,
+ hirohito: 88,
+ }
+ ]
+ ],
+ test: ages => {
+ const src = ages.toString();
+ if (!src.includes('for (')) throw new Error('Use for..in loop');
+ if (!src.includes(' in ')) throw new Error('Use for..in loop');
+ }
+})
diff --git a/README.md b/README.md
index 005400b..669b1c4 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
# Different implementation of iterations as a code abstraction
-[](https://www.youtube.com/watch?v=/VBMGnAPfmsY)
+[](https://www.youtube.com/watch?v=VBMGnAPfmsY)
[](https://www.youtube.com/watch?v=lq3b5_UGJas)
diff --git a/Solutions/3-while.js b/Solutions/3-while.js
index 66b639c..45bcb50 100644
--- a/Solutions/3-while.js
+++ b/Solutions/3-while.js
@@ -3,7 +3,7 @@
const sum = (...args) => {
let value = 0;
while (args.length > 0) {
- value += args.shift();
+ value += args.pop();
}
return value;
};
diff --git a/Solutions/4-do-while.js b/Solutions/4-do-while.js
index a2abea1..2d22dac 100644
--- a/Solutions/4-do-while.js
+++ b/Solutions/4-do-while.js
@@ -4,7 +4,7 @@ const sum = (...args) => {
if (args.length === 0) return 0;
let value = 0;
do {
- value += args.shift();
+ value += args.pop();
} while (args.length > 0);
return value;
};
diff --git a/Solutions/6-matrix.js b/Solutions/6-matrix.js
new file mode 100644
index 0000000..78369e8
--- /dev/null
+++ b/Solutions/6-matrix.js
@@ -0,0 +1,15 @@
+'use strict';
+
+const max = matrix => {
+ let value = matrix[0][0];
+ for (let i = 0; i < matrix.length; i++) {
+ const row = matrix[i];
+ for (let j = 0; j < row.length; j++) {
+ const cell = row[j];
+ if (value < cell) value = cell;
+ }
+ }
+ return value;
+};
+
+module.exports = { max };
diff --git a/Solutions/7-ages.js b/Solutions/7-ages.js
new file mode 100644
index 0000000..ccd520f
--- /dev/null
+++ b/Solutions/7-ages.js
@@ -0,0 +1,12 @@
+'use strict';
+
+const ages = persons => {
+ const data = {};
+ for (const name in persons) {
+ const person = persons[name];
+ data[name] = person.died - person.born;
+ }
+ return data;
+};
+
+module.exports = { ages };