Javascript array length returning 0

Question

When I am using console.log to print the array length , it returns 0 . But in the console , if I write txt.length it returns the actual length (i.e 60 in my case) . For this reason I can't iterate through the txt array.

var txt;

function preload() {
  txt = loadStrings("DataProcess/outData.txt");
  console.log(txt);
  console.log(txt.length);
}

Can we see what happens in loadStrings function? As you're passing a path to a file to that function, it badly seems, that there's some asyncronous action taken in the function. — Teemu
– Teemu, Commented Apr 28, 2020 at 16:21
it is the p5.js loadStrings function . p5js.org/reference/#/p5/loadStrings — Zarif
– Zarif, Commented Apr 28, 2020 at 16:23
@Zarif Visit this link p5 load string for string array you need use callback. callback: This is a function which is called after the function is successfully executed. The first argument for this function is the strings array. — Varooneh
– Varooneh, Commented Apr 28, 2020 at 16:24
Yep, "This method is asynchronous, meaning it may not finish before the next line in your sketch is executed". — Teemu
– Teemu, Commented Apr 28, 2020 at 16:25

EugenSunic · Accepted Answer · 2020-04-28 16:27:09Z

1

You need to get the length in the callback. from the docs the function accepts 3 arguments

loadStrings(filename, [callback], [errorCallback])

meaning you should do something like this:

var txt;

function preload() {
  loadStrings("DataProcess/outData.txt", (res) => {
    txt = res
    console.log(txt.length);
  })

}

answered Apr 28, 2020 at 16:27

EugenSunic

13.8k15 gold badges68 silver badges96 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Javascript array length returning 0

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related