const strings= ['a', 'b', 'c', 'd'];
const numbers = [1,2,3,4,5];
// Variable array is somewhere in memory and the computer knows it.
// When I do array[2], i'm telling the computer, hey go to the array and grab the 3rd item from where the array is stored.
//push
strings.push('e'); //O(1)
//pop
strings.pop(); //O(1)
strings.pop(); //O(1)
//unshift
strings.unshift('x') //O(n)
//splice
strings.splice(2, 0, 'alien');
console.log(strings)
class MyArray {
constructor() {
this.length = 0;
this.data = {};
}
get(index) {
return this.data[index];
}
push(item) {
this.data[this.length] = item;
this.length++;
return this.length;
}
pop() {
const lastItem = this.data[this.length - 1];
delete this.data[this.length - 1];
this.length--;
return lastItem;
}
delete(index) {
const item = this.data[index];
this.shiftItems(index);
return item;
}
shiftItems(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--;
}
}
const newArray = new MyArray();
newArray.push("hi");
newArray.push("you");
newArray.push("!");
newArray.pop();
newArray.delete(1);
console.log(newArray);
