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JS-classes-and-inheritance #2

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d5340a8
feat: create `BaseBuilder`, `IntBuilder`, `StringBuilder`
May 6, 2023
fb366a0
feat: add the tests
May 6, 2023
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15 changes: 15 additions & 0 deletions index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>JavaScript classes and inheritance</title>
<script src="script.js"></script>
<script src="tests.js"></script>
</head>
<body>
<h1>Task: JavaScript classes and inheritance</h1>
<p>See the results of the tests in the console😉</p>
</body>
</html>
107 changes: 107 additions & 0 deletions script.js
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// Создать базовый класс.
function BaseBuilder(value) {
this.value = value;
}

BaseBuilder.prototype.get = function() {
return this.value;
}

// Создать первый дочерний класс, который наследуется от базового (ES6).
class IntBuilder extends BaseBuilder {
constructor(value) {
super(value);
}

static random(min, max) {
return Math.floor(min + Math.random() * (max + 1 - min));
}

plus(...numbers) {
this.value += numbers.reduce((sum, item) => sum + item, 0);
return this;
}

minus(...numbers) {
this.value -= numbers.reduce((sum, item) => sum + item, 0);
return this;
}

multiply(number) {
this.value *= number;
return this;
}

divide(number) {
this.value /= number;
return this;
}

mod(number) {
this.value %= number;
return this;
}
}

// Создать второй дочерний класс, который наследуется от базового (ES5).
function StringBuilder(value) {
BaseBuilder.call(this, value);
}

StringBuilder.prototype = Object.create(BaseBuilder.prototype);

StringBuilder.prototype.plus = function(...strings) {
this.value += strings.join('');
return this;
};

StringBuilder.prototype.minus = function(number) {
this.value = this.value.slice(0, -number);
return this;
};

StringBuilder.prototype.multiply = function(number) {
const originalValue = this.value;
let result = '';
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Обрати внимание на метод repeat у стрингов. Думаю, он бы тут хорошо подошел

for (let counter = 0; counter < number; counter++) {
result += originalValue;
}
this.value = result;
return this;
};

StringBuilder.prototype.divide = function(number) {
const length = Math.floor(this.value.length / number);
this.sub(0, length);
return this;
};

StringBuilder.prototype.remove = function(string) {
let result = '';
let startPosition = 0;
while (true) {
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Думаю метод includes поможет в этом месте

const index = this.value.indexOf(string, startPosition);
if (index === -1) {
break;
}
if (index !== 0) {
result += this.value.slice(startPosition, index);
}
startPosition = index + string.length;
}
this.value = result + this.value.slice(startPosition);
return this;
};

StringBuilder.prototype.removeInAnotherWay = function(string) {
this.value = this.value
.split(string)
.filter(item => item !== string)
.join('');
return this;
};

StringBuilder.prototype.sub = function(start, length) {
this.value = this.value.substr(start, length);
return this;
};
28 changes: 28 additions & 0 deletions tests.js
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// Тестировать `IntBuilder`.
const randomNumber = IntBuilder.random(1, 100)
console.log('checkRandom', randomNumber);
console.assert(randomNumber >= 1 && randomNumber <= 100, 'Ожидаемый результат от 1 до 100, текущий результат', randomNumber);

const intBuilder = new IntBuilder(10);
const intResult = intBuilder
.plus(6, 7, 10, 5)
.minus(1, 4, 3, 2)
.multiply(7)
.divide(4)
.mod(5)
.get();
console.log('intResult', intResult);
console.assert(intResult === 4, 'Ожидаемый результат:', 4, 'Текущий результат:', intResult);

// Тестировать `StringBuilder`.
const stringBuilder = new StringBuilder('марципан');
const stringResult = stringBuilder
.plus(' невкусный', '!')
.minus(11)
.divide(4)
.multiply(2)
.remove('а')
.sub(1, 1)
.get();
console.log('stringResult', stringResult);
console.assert(stringResult === 'м', 'Ожидаемый результат: \'м\'. Текущий результат:', stringResult);