Consider following arrays:
var array1 = [true, false];
var array2 = [1, 2];
var array3 = ["a", "b", "c"];
I want to call my function myFunc(arg1, arg2, arg3) with all argument combinations. But I want to avoid to "foreach" hell.
Is it possible write function that allows me that, so i can call it some like:
cartesianCall(array1, array2, array3, myFunc);
ideally with variable count of arrays (myFunc arguments)?
EDIT: so function would be called:
myFunc(true, 1, "a");
myFunc(true, 1, "b");
myFunc(true, 1, "c");
myFunc(true, 2, "a");
myFunc(true, 2, "b");
myFunc(true, 2, "c");
myFunc(false, 1, "a");
myFunc(false, 1, "b");
myFunc(false, 1, "c");
myFunc(false, 2, "a");
myFunc(false, 2, "b");
myFunc(false, 2, "c");
                Declare you function without parameters and use arguments keyword:
function cartesianCall() {
  for (var i = 0; i < arguments.length; i++) {
     // do something with arguments[i]
  }
}
                        http://jsfiddle.net/trevordixon/zEqKy/
function cartesianCall(func, args) {
    var combos = allCombos.apply(this, args);
    for (var i = 0; i < combos.length; i++) {
        func.apply(null, combos[i]);
    }
}
function allCombos(first) {
    var isArray = toString.call(first) === "[object Array]";
    if (!isArray) first = [first]; // Convert non-array to an array with the value
                                   // as the only element
    else if (first.length === 0) first = [undefined]; // Convert empty array to an
                                                      // array with undefined as
                                                      // the only element
    if (arguments.length === 1) return first; // base case for recursion
    var result = [],
        rest = allCombos.apply(this, Array.prototype.slice.call(arguments, 1));
    for (var i = 0; i < first.length; i++) {
        for (var j = 0; j < rest.length; j++) {
            result.push([first[i]].concat(rest[j]));
        }
    }
    return result;
}
Then use it like this:
function printArgs() { console.log('Called with arguments:', arguments); }
cartesianCall(printArgs, [
    [true, false],
    undefined,
    [1, 2],
    [],
    'a string',
    ['a', 'b', 'c']
]);
Prints:
Called with arguments: [true, undefined, 1, undefined, "a string", "a"] 
Called with arguments: [true, undefined, 1, undefined, "a string", "b"] 
Called with arguments: [true, undefined, 1, undefined, "a string", "c"] 
Called with arguments: [true, undefined, 2, undefined, "a string", "a"] 
Called with arguments: [true, undefined, 2, undefined, "a string", "b"] 
Called with arguments: [true, undefined, 2, undefined, "a string", "c"] 
Called with arguments: [false, undefined, 1, undefined, "a string", "a"] 
Called with arguments: [false, undefined, 1, undefined, "a string", "b"] 
Called with arguments: [false, undefined, 1, undefined, "a string", "c"] 
Called with arguments: [false, undefined, 2, undefined, "a string", "a"] 
Called with arguments: [false, undefined, 2, undefined, "a string", "b"] 
Called with arguments: [false, undefined, 2, undefined, "a string", "c"]
Notice that empty arrays are treated the same as undefined.
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With