Instructions for systematically comparing one array to multiple other arrays with distinct names

Question

Instructions for systematically comparing one array to multiple other arrays with distinct names

Seeking guidance on correct syntax for iterating through arrays in order to compare a master array with a large number (180+) of systematically named arrays. Each comparison will involve an algorithm and the results will be stored in another set of arrays for future reference. The focus is currently on understanding the proper syntax for array iteration, rather than perfecting the algorithm itself.

for (i=01;i=186;i++){
  if (scorespec+(i)[04]=unknownspec[16]){
    resultarray+(i)[01]=True;
  else
    resultarray+(i)[01]=False;}}

The challenge lies in incorporating the counter variable into the variable name within the for-loop. Various syntax structures have been attempted without success. What is the recommended syntax for this specific scenario?

javascript arrays iterator variable-names

Answer 1

Answer №1

The for statement consists of three parts:

for ([initialExpression]; [condition]; [incrementExpression]) {
    // This is the action to be performed on each iteration
}

When iterating through an array, it's necessary to have the length of the array and a counter that will increment until it reaches the length. Typically, this is how it's done:

var myArray = ['foo', 'bar', 'far']; //...

for (var i = 0; i < myArray.length; i++) {
    myArray[i]; // <- current item in the array
}

It's a good practice to store the array's length in a variable for efficiency:

for (var i = 0, l = myArray.length; i < l; i++) {
    myArray[i]; // <- current item in the array
}

Just so you know, the boolean values true and false should not be capitalized.

Answer 2

The for statement consists of three parts:

for ([initialExpression]; [condition]; [incrementExpression]) {
    // This is the action to be performed on each iteration
}

When iterating through an array, it's necessary to have the length of the array and a counter that will increment until it reaches the length. Typically, this is how it's done:

var myArray = ['foo', 'bar', 'far']; //...

for (var i = 0; i < myArray.length; i++) {
    myArray[i]; // <- current item in the array
}

It's a good practice to store the array's length in a variable for efficiency:

for (var i = 0, l = myArray.length; i < l; i++) {
    myArray[i]; // <- current item in the array
}

Just so you know, the boolean values true and false should not be capitalized.

Answer 3

Answer №2

In the global scope, if you had declared your array, you could easily access them by using the window object:

var data1 = "abc";
var data2 = "xyz";

for (var i = 1; i < 3; i++) {
  alert(window['data' + i]);
}

Alternatively, you can resort to the slower and less recommended eval function:

var data1 = "abc";
var data2 = "xyz";

for (var i = 1; i < 3; i++) {
  var dataArray;
  eval("dataArray = data" + i);
  alert(dataArray);
}

Answer 4

In the global scope, if you had declared your array, you could easily access them by using the window object:

var data1 = "abc";
var data2 = "xyz";

for (var i = 1; i < 3; i++) {
  alert(window['data' + i]);
}

Alternatively, you can resort to the slower and less recommended eval function:

var data1 = "abc";
var data2 = "xyz";

for (var i = 1; i < 3; i++) {
  var dataArray;
  eval("dataArray = data" + i);
  alert(dataArray);
}

Instructions for systematically comparing one array to multiple other arrays with distinct names

Answer №1

Answer №2

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