feat: done task

index.js

@@ -0,0 +1,104 @@
+function CommonBuilder(value) {
+  this.value = value;
+}
+
+CommonBuilder.prototype.multiply = function (n) {
+  this.value *= n;
+  return this;
+};
+
+CommonBuilder.prototype.divide = function (n) {
+  this.value = Math.floor(this.value / n);
+  return this;
+};
+
+CommonBuilder.prototype.mod = function (n) {
+  this.value %= n;
+  return this;
+};
+
+CommonBuilder.prototype.get = function () {
+  return this.value;
+};
+
+
+function StringBuilder(str) {
+  CommonBuilder.call(this, str || '');
+}
+
+StringBuilder.prototype = Object.create(CommonBuilder.prototype);
+StringBuilder.prototype.constructor = StringBuilder;
+
+
+StringBuilder.prototype.plus = function (...str) {
+  for (var i = 0; i < str.length; i++) {
+    this.value += str[i];
+  }
+  return this;
+};
+
+StringBuilder.prototype.minus = function (n) {
+  this.value = this.value.slice(0, -n);
+  return this;
+};
+
+StringBuilder.prototype.multiply = function (n) {
+  this.value = new Array(n + 1).join(this.value);
+  return this;
+};
+
+StringBuilder.prototype.divide = function (n) {
+  this.value = this.value.slice(0, Math.floor(this.value.length / n));
+  return this;
+};
+
+StringBuilder.prototype.remove = function (str) {
+  var index = this.value.indexOf(str);
+  while (index !== -1) {
+    this.value = this.value.slice(0, index) + this.value.slice(index + str.length);
+    index = this.value.indexOf(str);
+  }
+  return this;
+};
+
+StringBuilder.prototype.sub = function (from, n) {
+  this.value = this.value.substr(from, n);
+  return this;
+};
+
+
+class IntBuilder extends CommonBuilder {
+  constructor(int = 0) {
+    super(int);
+  }
+
+  static random(from, to) {
+    return Math.floor(Math.random() * (to - from + 1) + from);
+  }
+
+  plus(...n) {
+    this.value += n.reduce((sum, current) => sum + current, 0);
+    return this;
+  }
+
+  minus(...n) {
+    this.value -= n.reduce((difference, current) => difference + current, 0);
+    return this;
+  }
+}
+
+
+
+const intBuilder = new IntBuilder(10);
+console.log(intBuilder.plus(5, 8).get());
+console.log(intBuilder.minus(2, 3).get());
+
+const strBuilder = new StringBuilder('Hello');
+console.log(strBuilder.plus(' ', 'World').get());
+console.log(strBuilder.multiply(3).get());
+console.log(strBuilder.divide(2).get());
+console.log(strBuilder.remove('l').get());
+console.log(strBuilder.sub(4, 5).get());
+console.log(strBuilder.minus(2).get());
+
+console.log(IntBuilder.random(1, 100));