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Norak
Asked: 2020-11-15 02:01:07 +0800 CST 2020-11-15 02:01:07 +0800 CST

Generate arrays dynamically and add elements in the same way

  • 772

I have to save the difference of X files (pages of a pdf) and I need the differences of that page to be saved in each array (one per page).

I have managed to generate empty arrays dynamically, but my problem is how to push those arrays dynamically as well?

The content that must be "dynamic", since I don't know the total number of pages can vary, is that of the nested if that I show in the code:

    //genera dinámicamente los arrays en los que se guardaran diferencias de cada página (el número total de páginas es allPages.length)

    for (i=1; i<=allPages.length; i++) {
        eval("diffPage"+i+"="+"[]");
    }

    var pairs = []; //Ej. var combinations = ["texto1","texto2","4"];

    for (var x=0; x<pairs.length; x++){

        var diff = recognizeTerms(comb[x], 5, 50); //diferencias de todas las combinaciones posibles

        for (y=1; y<allPages.length; y++) {

            for (z=0; z<diff.length; z++) {

                //A partir de aquí:
                //¿Hay alguna manera de hacer este guardado en arrays dinámico?
                //Ya que se deben guardar las diferencias de cada página en un array

                if (combinations[x][2] == 1) {
                    if (diffPage1.includes(diff[z]) == false) { //comprueba que el string no existe ya en el array de diferencias
                        diffPage1.push(diff[z]);
                    }
                } 
                if (combinations[x][2] == 2) {
                    if (diffPage2.includes(diff[z]) == false) {
                        diffPage2.push(diff[z]);
                    }
                } 
                if (combinations[x][2] == 3) {
                    if (diffPage3.includes(diff[z]) == false) {
                        diffPage3.push(diff[z]);
                    }
                } 
                if (combinations[x][2] == 4) {
                    if (diffPage4.includes(diff[z]) == false) {
                        diffPage4.push(diff[z]);
                    }
                }

                //sucesivos if ... (tantos como números de página haya), por ello necesito que sean dinámicos esos if
            }

        }

    }
javascript

1 Answers

  1. Best Answer

    What you have to do is save the arrays in an array. That way you fix two things: you don't use eval, which is always a bad idea, and you know the number of arrays you have:

    So your first loop looks like this:

    let diffPages=[];
for (let i=0; i<allPages.length; i++) {
    diffPages.push([]);
}

    and your innermost loop looks like this:

            for (z=0; z<diff.length; z++) {

          for (let page=0;page<diffPages.length;page++) {

            if (combinations[x][2] == page) {
              if (diffPages[page].includes(diff[z]) == false) { //comprueba que el string no existe ya en el array de diferencias
                    diffPages[page].push(diff[z]);
              }
            }
          }
        }

    And the loop for (y=1; y<allPages.length; y++) {is left over because you're not using it yfor anything.

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