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I am developing an angular project. I have a table file I want to compare each element with a data value if it is correct I will do statement else I will do another comportement but my problem is that even the data is correct it always fetches all the table and should access in the else for a very short time. How to avoid that, please.

Here is my code:

if (this.data) {
  this.imgNotFoundText = '';
  this.data.package.files.forEach(element => {
    i++;
    this.picture = '';
    if (element.name == this.data.properties.Name) {
      this.picture = 'picOne.png'
    }
    if (i == this.data.package.files.length && this.picture == '') {
      this.picture = './../assets/img/notFound.jpg'
    }
  });
}

I see a couple of possible problems:

  1. It seems suspect to always do this.picture = ''; unconditionally in the loop. If you're going to do that, you may as well only look at the last entry in the array. You probably want to move that to before the forEach call.

  2. You've referred to an else, but there is no else in your code. You have two ifs in a row, but the result of the first if doesn't have any effect at all on the second one. You may have wanted else if. Then, the second if isn't performed if the condition in the first if was true.

So if both of those guesses are right:

if (this.data) {
    this.imgNotFoundText = '';
    this.picture = '';
    this.data.package.files.forEach(element => {
        i++;
        if (element.name == this.data.properties.Name) {
            this.picture = 'picOne.png'
        } else if (i == this.data.package.files.length && this.picture == '') {
            this.picture = './../assets/img/notFound.jpg'
        }
    });
}

Side note: You haven't shown how i is initialized, but if it's used to track the index of the current entry of the forEach, there's no need: forEach receives that as a second argument:

if (this.data) {
    this.imgNotFoundText = '';
    this.picture = '';
    this.data.package.files.forEach((element, index) => {
    // -----------------------------^^^^^^^^^^^^^^^^
        if (element.name == this.data.properties.Name) {
            this.picture = 'picOne.png'
        } else if (index == this.data.package.files.length && this.picture == '') {
    // ------------^^^^^
            this.picture = './../assets/img/notFound.jpg'
        }
    });
}

You also might want to avoid that second if altogether, by just specifying the "not found" default before the loop:

if (this.data) {
    this.imgNotFoundText = '';
    const {files} = this.data.package;
    this.picture = files.length ? './../assets/img/notFound.jpg' : '';
    files.forEach(element => {
        if (element.name == this.data.properties.Name) {
            this.picture = 'picOne.png'
        }
    });
}

In that I've assumed this.picture should be '' if there are no entries in files, or the "not found" image if there's at least one entry. The loop will overwrite it if it finds a match.

Continuing from there, unless there can be multiple entries in files with the same name, you probably want to stop as of the first match. So:

if (this.data) {
    this.imgNotFoundText = '';
    const {files} = this.data.package;
    this.picture = files.length ? './../assets/img/notFound.jpg' : '';
    for (const {name} of files) {
        if (name == this.data.properties.Name) {
            this.picture = 'picOne.png'
            break;
        }
    }
}

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Not sure what your goal is but you're just iterating through the list and setting the picture value every time, this means you'll have as result the last element's picture value.

If your goal is to display a "not found" picture for elements who don't have files, you need to have an array of pictures that reflects the array of files (or add a property picture to each file).

How to use foreach and if statement within array of arrays , However, I want to show additional checkboxes using the foreach and if statement. foreach : this will display additional checkboxes for every field in the� Solution: Not sure where the problem is :) That if statement above seems perfectly fine to me. What sort of output do you want to receive from this script?

Looks like you can use Array.prototype.some

if (this.data) {
  this.imgNotFoundText = '';
  this.picture = this.data.package.files.some(
  (element) => element.name === this.data.properties.Name
  ) ? 'picOne.png' : './../assets/img/notFound.jpg'
}

It'll return picOne.png if any of the items in data.package.files has a name that is same as this.data.properties.Name or it'll return notFound.jpg

Although that could

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Comments
  • "it always fetch all the table and should access in the else for a very short time" There is no else in your code...?
  • When asking for help, it's best to indent your code in a consistent, fairly standard way, as it helps people read and understand your code. (It's useful when you're not asking for help, too.)
  • the else is the second if
  • Separately: It seems suspect to always do this.picture = ''; unconditionally in the loop. If you're going to do that, you may as well only look at the last entry in the array. You probably want to move that to before the forEach call.
  • No, there's a big difference between two ifs in a row and if/else if.
  • my problem that even i have a file the notFound picture is displayed for a short time then the right picture displayed
  • This suggests that you should use a temporary variable to storing the result, and assign it to this.picture only after the cycle is done. Also a break statement at the first successful result should be used as in previous answer.