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JavaScript DOM Scripting By Example Adding and Removing Names Registering Names

Jonathan Grieve
MOD
Jonathan Grieve
Treehouse Moderator 91,252 Points

Dom Scripting and Memory Usage

Just a quick question on memory using.

When Guil started talking about cleaning the text from the input field when adding names, I decided to pause and jump ahead and this was my solution for clearing the value from the input field.

form.addEventListener('submit', (e) => {
    e.preventDefault();
    //console.log(input.value);
    const text = input.value;
    const ul = document.getElementById('invitedList');
    const li = document.createElement('li');
    li.textContent = text;
    var clear = input.value = "";
    ul.appendChild(li)
});

I created a variable, clear for clearing the value of input to an empty string. Then Guil showed that I didn't need to add a variable. Is each way equally valid? I don't think it matters too much in this instance but maybe for a larger project, bandwidth might become an issue.

1 Answer

Steven Parker
Steven Parker
229,921 Points

The variable clear in the example serves no purpose.

The portion of the code that empties the form field is: input.value = "".

Jonathan Grieve
Jonathan Grieve
Treehouse Moderator 91,252 Points

Hi Steven,

Thanks this clears it up anyway. So it doesn't need a variable as it's a method that performs an action on it's own and already has a reference to the element it's forming the clear string on.