Javascript syntax error

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Javascript syntax error

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#1 by (4 votes)
#2 by (3 votes)

3

I am testing a code snippet here in javascript and it is giving syntax error on line 12. It says that there is a ; missing somewhere, but I have already rolled that code and can not find the error.

This code was originally written in C and I'm trying to adapt to a specific problem using javascript. I have changed values set to integers for var , I have already changed to type char since javascript is weakly typed and == means that it "skips" the type differences of the variables.

    var arr = ["1", "2", "3", "4", "5"];
    var r = "3";
    var n = (arr.length)/(arr[0].length);
    var data[r];

    function combinationUtil(var arr[], var data[], var start, var end, var index, var r)
    {
      // Current combination is ready to be printed, print it
      if (index == r)
      {
        for (var j=0; j<r; j++){
          console.log(data[j]);
          //document.getElementById("demo").innerHTML = data[j];

        }

      }

      // replace index with all possible elements. The condition
      // "end-i+1 >= r-index" makes sure that including one element
      // at index will make a combination with remaining elements
      // at remaining positions
      for (var i=start; i<=end && end-i+1 >= r-index; i++)
      {
        data[index] = arr[i];
        combinationUtil(arr, data, i+1, end, index+1, r);

      }
    }

    combinationUtil(arr, data, 0, n-1, 0, r);

    <p id="demo"></p>

javascript html

asked by anonymous 23.11.2015 / 14:51

2 answers

4

Remove the var and the [] of the parameters of the combinationUtil function, because of the way it is, it gives a syntax error.

function combinationUtil(arr, data, start, end, index, r)
{

    if (index == r)
    {
        for (var j = 0; j < r; j++) {
            console.log(data[j]);
        }

    }

    for (var i = start; i <= end && end-i+1 >= r-index; i++)
    {
        data[index] = arr[i];
        combinationUtil(arr, data, i+1, end, index+1, r);

    }
}

23.11.2015 / 15:07

Divide a date into two parts Error java.lang.NoClassDefFoundError: org / slf4j / LoggerFactory

score 3 · Accepted Answer

In addition to the syntax error pointed out by @YurePereira, we still have the error of line 12:

var data[r];

You are declaring this array the wrong way, in which case you have two options:

Without informing the size of the array, let the JavaScript set it at runtime.

var data = [];

Create an Array object of size r.

var data = new Array(r);

Here's how your script works:

var data = [];
var arr = [1, 2, 3, 4, 5];
var r = 3;
var n = arr.length;

var demo = document.getElementById("demo");

function combinationUtil(arr, data, start, end, index, r)
{
  // Current combination is ready to be printed, print it
  if (index == r)
  {
    var demo = document.createElement("div");
    demo.innerHTML = JSON.stringify(data.slice(0, r));
    document.body.appendChild(demo);
  }

  // replace index with all possible elements. The condition
  // "end-i+1 >= r-index" makes sure that including one element
  // at index will make a combination with remaining elements
  // at remaining positions
  for (var i=start; i<=end && end-i+1 >= r-index; i++)
  {
    data[index] = arr[i];
    combinationUtil(arr, data, i+1, end, index+1, r);
  }
}

combinationUtil(arr, data, 0, n-1, 0, r);