From 096e8eedbffffbfae92eb7ff3cdd3771e07a059f Mon Sep 17 00:00:00 2001
From: Timur Shemsedinov <timur.shemsedinov@gmail.com>
Date: Mon, 14 Oct 2019 23:48:32 +0300
Subject: [PATCH 1/7] Fix video
Closes #16
---
README.md | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
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)
From 9c7edda86fa583dd1f94e9b4c5ff56337addc125 Mon Sep 17 00:00:00 2001
From: Timur Shemsedinov <timur.shemsedinov@gmail.com>
Date: Tue, 15 Oct 2019 12:16:04 +0300
Subject: [PATCH 2/7] Add nested loops task
---
Exercises/6-matrix.js | 9 +++++++++
Exercises/6-matrix.test | 13 +++++++++++++
Solutions/6-matrix.js | 15 +++++++++++++++
3 files changed, 37 insertions(+)
create mode 100644 Exercises/6-matrix.js
create mode 100644 Exercises/6-matrix.test
create mode 100644 Solutions/6-matrix.js
diff --git a/Exercises/6-matrix.js b/Exercises/6-matrix.js
new file mode 100644
index 0000000..b768c0a
--- /dev/null
+++ b/Exercises/6-matrix.js
@@ -0,0 +1,9 @@
+'use strict';
+
+const max = matrix => {
+ // Use nested for loop to find max value in 2d matrix
+ // For example max([[1, 2, 3], [4, 5, 6], [7, 8, 9]])
+ // should return 9
+};
+
+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/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 };
From d20b5b6b0fa8d6d9ca680ae225a2188b117fb31d Mon Sep 17 00:00:00 2001
From: Timur Shemsedinov <timur.shemsedinov@gmail.com>
Date: Tue, 15 Oct 2019 13:04:11 +0300
Subject: [PATCH 3/7] Add for..in task
---
Exercises/7-ages.js | 19 +++++++++++++++++++
Exercises/7-ages.test | 24 ++++++++++++++++++++++++
Solutions/7-ages.js | 12 ++++++++++++
3 files changed, 55 insertions(+)
create mode 100644 Exercises/7-ages.js
create mode 100644 Exercises/7-ages.test
create mode 100644 Solutions/7-ages.js
diff --git a/Exercises/7-ages.js b/Exercises/7-ages.js
new file mode 100644
index 0000000..fc8089b
--- /dev/null
+++ b/Exercises/7-ages.js
@@ -0,0 +1,19 @@
+'use strict';
+
+const ages = persons => {
+ // Use for..in to calculate age for each person
+ // For example ages({
+ // lenin: { born: 1870, died: 1924 },
+ // mao: { born: 1893, died: 1976 },
+ // gandhi: { born: 1869, died: 1948 },
+ // hirohito: { born: 1901, died: 1989 },
+ // })
+ // should return {
+ // lenin: 54,
+ // mao: 83,
+ // gandhi: 79,
+ // hirohito: 88,
+ // }
+};
+
+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/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 };
From bebe19a84c4baa9ec3904128b3fd6659a4f95dc4 Mon Sep 17 00:00:00 2001
From: Timur Shemsedinov <timur.shemsedinov@gmail.com>
Date: Tue, 15 Oct 2019 13:30:55 +0300
Subject: [PATCH 4/7] Add exercises description
---
Exercises.ru.md | 47 +++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 47 insertions(+)
create mode 100644 Exercises.ru.md
diff --git a/Exercises.ru.md b/Exercises.ru.md
new file mode 100644
index 0000000..5ad702f
--- /dev/null
+++ b/Exercises.ru.md
@@ -0,0 +1,47 @@
+# Упражнения
+
+## Итерирование циклами
+
+Руализуйте 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,
+// }
+```
From 3fd6be562f0d2db75d8f27d1e570e8e39807d202 Mon Sep 17 00:00:00 2001
From: Vladyslav Tkachenko <tkachenko94ua@gmail.com>
Date: Tue, 15 Oct 2019 14:47:02 +0000
Subject: [PATCH 5/7] Done all tasks
---
Exercises/1-for.js | 8 +++++---
Exercises/2-for-of.js | 6 +++---
Exercises/3-while.js | 10 +++++++---
Exercises/4-do-while.js | 12 +++++++++---
Exercises/5-reduce.js | 5 +----
Exercises/6-matrix.js | 12 +++++++++---
Exercises/7-ages.js | 18 +++++-------------
7 files changed, 39 insertions(+), 32 deletions(-)
diff --git a/Exercises/1-for.js b/Exercises/1-for.js
index 62e6ab8..7dcca00 100644
--- a/Exercises/1-for.js
+++ b/Exercises/1-for.js
@@ -1,9 +1,11 @@
'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
+ let sum = 0;
+ for (let i = 0; i < args.length; i++) {
+ sum += args[i];
+ }
+ return sum;
};
module.exports = { sum };
diff --git a/Exercises/2-for-of.js b/Exercises/2-for-of.js
index 9965f25..c9ac0c0 100644
--- a/Exercises/2-for-of.js
+++ b/Exercises/2-for-of.js
@@ -1,9 +1,9 @@
'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 sum = 0;
+ for (const i of args) sum += i;
+ return sum;
};
module.exports = { sum };
diff --git a/Exercises/3-while.js b/Exercises/3-while.js
index 6110b9f..7a330a4 100644
--- a/Exercises/3-while.js
+++ b/Exercises/3-while.js
@@ -1,9 +1,13 @@
'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 sum = 0;
+ let i = 0;
+ while (i < args.length) {
+ sum += args[i];
+ i++;
+ }
+ return sum;
};
module.exports = { sum };
diff --git a/Exercises/4-do-while.js b/Exercises/4-do-while.js
index 22d4464..61409e1 100644
--- a/Exercises/4-do-while.js
+++ b/Exercises/4-do-while.js
@@ -1,9 +1,15 @@
'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
+ if (args.length < 1) return 0;
+ let sum = 0;
+ let i = 0;
+ do {
+ sum += args[i];
+ i++;
+ }
+ while (i < args.length);
+ return sum;
};
module.exports = { sum };
diff --git a/Exercises/5-reduce.js b/Exercises/5-reduce.js
index a9cb44c..a1dcdf3 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((result, val) => result + val, 0);
module.exports = { sum };
diff --git a/Exercises/6-matrix.js b/Exercises/6-matrix.js
index b768c0a..5ee8101 100644
--- a/Exercises/6-matrix.js
+++ b/Exercises/6-matrix.js
@@ -1,9 +1,15 @@
'use strict';
const max = matrix => {
- // Use nested for loop to find max value in 2d matrix
- // For example max([[1, 2, 3], [4, 5, 6], [7, 8, 9]])
- // should return 9
+ let max = 0;
+ for (let i = 0; i < matrix.length; i++) {
+ for (let j = 0; j < matrix[i].length; j++) {
+ //max = max < matrix[i][j] ? matrix[i][j] : max;
+ if (max < matrix[i][j]) max = matrix[i][j];
+ }
+ }
+ return max;
};
+
module.exports = { max };
diff --git a/Exercises/7-ages.js b/Exercises/7-ages.js
index fc8089b..21badb8 100644
--- a/Exercises/7-ages.js
+++ b/Exercises/7-ages.js
@@ -1,19 +1,11 @@
'use strict';
const ages = persons => {
- // Use for..in to calculate age for each person
- // For example ages({
- // lenin: { born: 1870, died: 1924 },
- // mao: { born: 1893, died: 1976 },
- // gandhi: { born: 1869, died: 1948 },
- // hirohito: { born: 1901, died: 1989 },
- // })
- // should return {
- // lenin: 54,
- // mao: 83,
- // gandhi: 79,
- // hirohito: 88,
- // }
+ const ages = {};
+ for (const element in persons) {
+ ages[element] = persons[element]['died'] - persons[element]['born'];
+ }
+ return ages;
};
module.exports = { ages };
From 0e3260b9fc0f6dba5dd79da568b15254aa24c808 Mon Sep 17 00:00:00 2001
From: Vladyslav Tkachenko <tkachenko94ua@gmail.com>
Date: Wed, 16 Oct 2019 15:44:13 +0300
Subject: [PATCH 6/7] Fixed tasks: 2, 3, 4, 6, 7
---
Exercises/2-for-of.js | 6 +++---
Exercises/3-while.js | 10 ++++------
Exercises/4-do-while.js | 13 +++++--------
Exercises/6-matrix.js | 12 ++++++------
Exercises/7-ages.js | 9 +++++----
5 files changed, 23 insertions(+), 27 deletions(-)
diff --git a/Exercises/2-for-of.js b/Exercises/2-for-of.js
index c9ac0c0..e18aa25 100644
--- a/Exercises/2-for-of.js
+++ b/Exercises/2-for-of.js
@@ -1,9 +1,9 @@
'use strict';
const sum = (...args) => {
- let sum = 0;
- for (const i of args) sum += i;
- return sum;
+ let result = 0;
+ for (const i of args) result += i;
+ return result;
};
module.exports = { sum };
diff --git a/Exercises/3-while.js b/Exercises/3-while.js
index 7a330a4..16410fc 100644
--- a/Exercises/3-while.js
+++ b/Exercises/3-while.js
@@ -1,13 +1,11 @@
'use strict';
const sum = (...args) => {
- let sum = 0;
- let i = 0;
- while (i < args.length) {
- sum += args[i];
- i++;
+ let result = 0;
+ while (args.length > 0) {
+ result += args.pop();
}
- return sum;
+ return result;
};
module.exports = { sum };
diff --git a/Exercises/4-do-while.js b/Exercises/4-do-while.js
index 61409e1..0776836 100644
--- a/Exercises/4-do-while.js
+++ b/Exercises/4-do-while.js
@@ -1,15 +1,12 @@
'use strict';
const sum = (...args) => {
- if (args.length < 1) return 0;
- let sum = 0;
- let i = 0;
+ if (args.length === 0) return 0;
+ let result = 0;
do {
- sum += args[i];
- i++;
- }
- while (i < args.length);
- return sum;
+ result += args.pop();
+ } while (args.length > 0);
+ return result;
};
module.exports = { sum };
diff --git a/Exercises/6-matrix.js b/Exercises/6-matrix.js
index 5ee8101..ccf7973 100644
--- a/Exercises/6-matrix.js
+++ b/Exercises/6-matrix.js
@@ -1,15 +1,15 @@
'use strict';
const max = matrix => {
- let max = 0;
+ let result = matrix[0][0];
for (let i = 0; i < matrix.length; i++) {
- for (let j = 0; j < matrix[i].length; j++) {
- //max = max < matrix[i][j] ? matrix[i][j] : max;
- if (max < matrix[i][j]) max = matrix[i][j];
+ const row = matrix[i];
+ for (let j = 0; j < row.length; j++) {
+ const cell = row[j];
+ if (result < cell) result = cell;
}
}
- return max;
+ return result;
};
-
module.exports = { max };
diff --git a/Exercises/7-ages.js b/Exercises/7-ages.js
index 21badb8..8c267c5 100644
--- a/Exercises/7-ages.js
+++ b/Exercises/7-ages.js
@@ -1,11 +1,12 @@
'use strict';
const ages = persons => {
- const ages = {};
- for (const element in persons) {
- ages[element] = persons[element]['died'] - persons[element]['born'];
+ const data = {};
+ for (const name in persons) {
+ const person = persons[name];
+ ages[name] = person.died - persons.born;
}
- return ages;
+ return data;
};
module.exports = { ages };
From f432fb3e12c80bef973de1f22be2e07f3e656b71 Mon Sep 17 00:00:00 2001
From: Vladyslav Tkachenko <tkachenko94ua@gmail.com>
Date: Wed, 16 Oct 2019 12:48:04 +0000
Subject: [PATCH 7/7] Fixed task 7
---
Exercises/7-ages.js | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/Exercises/7-ages.js b/Exercises/7-ages.js
index 8c267c5..ccd520f 100644
--- a/Exercises/7-ages.js
+++ b/Exercises/7-ages.js
@@ -4,7 +4,7 @@ const ages = persons => {
const data = {};
for (const name in persons) {
const person = persons[name];
- ages[name] = person.died - persons.born;
+ data[name] = person.died - person.born;
}
return data;
};