Hello Guys Today i am going to show you how you can apply filter on map function.

So why i have to use filter method on map function well here is the problem i faced

<div>
   {props.list.map((item) => {
      return (
         <div key={item._id}>
           <div>
             <h1>Username - {item.username}</h1>
             <h1>Email - {item.email}</h1>
             <h1>Password - {item.password}</h1>
           </div>
           <div>
            <button
               onClick={(e) => {
                 updateUser(item._id);
                }} >
              Update          
            </button>
        </div>
       );
     })}

The problem i was facing is i have attached a button to update elements , i want to get the element id of that particular element which i want to update , here comes the filter method to rescue

...
  const [updateId, setUpdateId] = useState("");
  const [updateEmail, setUpdateEmail] = useState("");
  const [updateUsername, setUpdateUsername] = useState("");
  const [updatePassword, setUpdatePassword] = useState("");

  const updateUser = (id) => {
    const filtered = list.filter((user) => user._id === id);
    setUpdateId(filtered[0]._id);
    setUpdateEmail(filtered[0].email);
    setUpdateUsername(filtered[0].username);
    setUpdatePassword(filtered[0].password);
  };


...

Explaination

• Here i have created a state called "updatedId" which will store the id of the element which i want to update.
• Then i created an arrow function "updatedUser" with parameter "id" this is the unique id which we will pass using our update button onClick method.
• Then we created a filter which returns the single user by comparing it to the id we have passed to the function if the id is present in the list.

• Then we set the updatedId using "setUpdatedId(filtered[0]._id)", what it means the "filtered" is an array with only one element and "filtered[0]._id" means we are getting the id of that element and provide it to the "updatedId" state , now using this unique id ,we can update the user information by passing this id to the backend.

• Also we have used "filtered[0].username","filtered[0].email" and "filtered[0].password",this will take the email, username and password assigned to that used id.

Thats it for this post.
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