My player don't jump!!

Questions & Answers
1

This is my code , I see it from a video on YT and I dont know de problem

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class movej : MonoBehaviour {

public float moveSpeed;
public float jump;
bool grounded = false;

void Update()
{
    if (Input.GetKey(KeyCode.RightArrow))
        transform.Translate(Vector3.right * moveSpeed * Time.deltaTime);
    if (Input.GetKey(KeyCode.LeftArrow))
        transform.Translate(-Vector2.right * moveSpeed * Time.deltaTime);

    if (Input.GetKeyDown(KeyCode.Space))
    {
        if (grounded) {
   
            GetComponent<Rigidbody2D>().velocity = new Vector2(
            GetComponent<Rigidbody2D>().velocity.x, jump);
        }
    }
}

void OnTriggerEnter2D()
{
    grounded = true;
}

void OnTriggerExit2D()
{
    grounded = false;
}

}

2

You used Vector2 2 times and on unity 5+ you cant do that