123
            
let numbers: number[] = [1, 2, 3];
let newLength = numbers.push(4);
console.log(numbers);

              
123
            
let numbers: number[] = [1, 2, 3];
let newLength = numbers.push(4, 5);
console.log(numbers);

              
1234
            
let numbers: number[] = [1, 2, 3];
let lastElement = numbers.pop();
console.log(`array after modifying: ${numbers}`);
console.log(`the last element was ${lastElement}`);

              
123
            
let numbers: number[] = [1, 2, 3];
let firstElement = numbers.shift();
console.log(`numbers: ${numbers}, deleted element: ${firstElement}`);

              
123
            
let numbers: number[] = [2, 3, 4];
let newLength = numbers.unshift(0, 1);
console.log(`numbers: ${numbers} with length: ${newLength}`); 

              
1234
            
let array1: number[] = [1, 2];
let array2: number[] = [3, 4];
let combinedArray = array1.concat(array2); 
console.log(`combined array = ${combinedArray}`);

              
123
            
let numbers: number[] = [1, 2, 3, 4, 5];
let slicedArray = numbers.slice(1, 4); 
console.log(`sliced array = ${slicedArray}`);