learn about array methods in javascript

GameOfCode64 · GameOfCode64 · commit bfd0a7d151c8 · 2024-07-16T18:14:51.000+05:30
diff --git a/day3.js b/day3.js
@@ -0,0 +1,69 @@
+// ! Day 2 of learning DSA in Javascript
+
+// * Topic (Array Data Structure)
+
+// Todo: Array Method list:
+
+// * 1, push()      -->    adds a new element to the end of an array and returns the new length of an array,
+// * 2, Get()       -->    get the element by it's index from an array and returns the element
+// * 3, pop()       -->    removes the last element of an array and return the removed element,
+// * 4, shift()     -->    removes the first element of an array and return the removed element,
+
+class MyArray {
+  constructor() {
+    this.length = 0;
+    this.data = {};
+  }
+  push(item) {
+    this.data[this.length] = item;
+    this.length++;
+    return this.length;
+  }
+  get(index) {
+    return this.data[index];
+  }
+  pop() {
+    const lastElement = this.data[this.length - 1];
+    delete this.data[this.length - 1];
+    this.length--;
+    return lastElement;
+  }
+
+  shift() {
+    const firstElement = this.data[0];
+    for (let i = 0; i < this.length; i++) {
+      this.data[i] = this.data[i + 1];
+    }
+    delete this.data[this.length - 1];
+    this.length--;
+    return firstElement;
+  }
+  delete(index) {
+    const deletedElement = this.data[index];
+
+    for (let i = index; i < this.length - 1; i++) {
+      this.data[i] = this.data[i + 1];
+    }
+
+    delete this.data[this.length - 1];
+    this.length--;
+
+    return deletedElement;
+  }
+}
+
+const MyNewArray = new MyArray();
+
+console.log(MyNewArray.push("apple"));
+console.log(MyNewArray.push("mango"));
+console.log(MyNewArray.push("orange"));
+console.log(MyNewArray.push("banana"));
+
+console.log(MyNewArray);
+
+console.log(MyNewArray.get(2));
+console.log(MyNewArray.pop());
+console.log(MyNewArray.shift());
+console.log(MyNewArray.delete(1));
+
+console.log(MyNewArray);
diff --git a/test/palindromes.js b/test/palindromes.js
@@ -0,0 +1,10 @@
+const isPalindromes = (word) => {
+  let reverse = word.split("").reverse().join("");
+  if (reverse === word) {
+    return true;
+  } else {
+    return false;
+  }
+};
+
+console.log(isPalindromes("abba"));
diff --git a/test/reverseInt.js b/test/reverseInt.js
@@ -0,0 +1,7 @@
+const reverseInt = (value) => {
+  let number = value.toString().split("").reverse().join("");
+  parseInt(number);
+  console.log(number);
+};
+
+console.log(reverseInt(1234));
diff --git a/test/reverseString.js b/test/reverseString.js
@@ -0,0 +1,10 @@
+// ! DSA Test 1
+
+// * Make a Function to Reverse The String
+
+const reverse = (value) => {
+  const name = value.split("").reverse().join("");
+  console.log(name);
+};
+
+reverse("Bhavishya");
