compare a list of values to an array ...

[kigoobe]

Hi gits

thanks for your reply. I am sorry about the link, I didn't think that way. I will be more careful from now.

The function as it stands now, is still giving me issues, and I need a way to reload a given array. I was wondering if you could help.

Here is the situation, the image below is of two examples of a given array, say array_1, when I call a function.

I need a way to reload this array, on function call, in other words, I need to delete unwanted entries.

Here is another array (say array_2) that I have created for that purpose, called with the same function.

The idea is, if array_1 is represented as ex. 1 while calling the function, array_1 should become -

'0'=>"41~0"
'1'=>"43~0"
'2'=>"45~0"

and if array_1 is represented as ex. 2 while calling the function, array_1 should become -

'0'=>"41~0"
'1'=>"43~2"
'2'=>"45~2"

ie, keep whatever is after the ~ or replace by 0 in case there is none, match the first part of value, and delete the rest where the first part is not a part of array_2. Given that, the values of array_1 and array_2 may or maynot be in the same order. Or, the values of array_2 can be hidden without any order in array_1, or may be totally absent, as in ex. 1

Do you have anything to propose me here?
Thanks again.

[gits]

hi ...

do you mean something like this:

var array_1 = [ '11~0', '56~0', '57~2', '58~1' ];
var look_up = { 0: 41, 1: 43, 2: 45 };
 
function lookup_list(arr, map) {
    var a = [];
 
    for (var i in map) {
        var temp = arr[i].match(/[^\~]+$/);
        a.push(map[i] + '~' + temp);
    }
 
    return a;
}
 
var b = lookup_list(array_1, look_up);
 

kind regards

[kigoobe]

Hi gits

Honestly speaking my javascript is not so develop to understand what you wrote, but I will try with this example now, will let you know then ... thanks :)

[gits]

Hi gits

Honestly speaking my javascript is not so develop to understand what you wrote, but I will try with this example now, will let you know then ... thanks :)

ok ... let me comment it a bit:

// one of your arrays
var array_1 = [ '11~0', '56~0', '57~2', '58~1' ];
 
// instead of an array we use a hashmap here (js-object)
// to iterate and store the values to add - represents your
// second array
var look_up = { 0: 41, 1: 43, 2: 45 };
 
// declare a function that compares array_1 and the map
function lookup_list(arr, map) {
    // literally declare an array ... always prefer this instead
    // of using new Array
    var a = [];
 
    // iterate through the map - i are the keys
    for (var i in map) {
        // use a regExp to match from the end until
        // a '~' is found
        var temp = arr[i].match(/[^\~]+$/);
 
        // add the value to our new array a
        a.push(map[i] + '~' + temp);
    }
 
    // return the new array
    return a;
}
 
// b gets the new array from our function assigned
var b = lookup_list(array_1, look_up);
 

kind regards

[kigoobe]

Hi Gits

Must tell, you are a real genious ... :)

Yeah, it's working as it should ... I'm really surprized the way you manged to do that with such a small function. I thought it would be much longer. And thanks for your explanation. Also, I didn't know it's better to declare a js array with [] instead of doing that with new. Something new I learned :)

I think the heart of that full code is this line

var temp = arr[i].match(/[^\~]+$/);

It's highly complex, conceptually, I must admit.
Thanks again genious :)

[gits]

we have to do a little adaption ... since it could be that you would have a key in the list that wouldn't have a corresponding key in the array:

var array_1 = [ '11~0', '56~0', '57~2', '58~1' ];
var look_up = { 0: 41, 1: 43, 2: 45 };
 
function lookup_list(arr, map) {
    var a = [];
 
    for (var i in map) {
        if (typeof arr[i] != 'undefined') {
            var temp = arr[i].match(/[^\~]+$/);
            a.push(map[i] + '~' + temp);
        }
    }
 
    return a;
}
 
var b = lookup_list(array_1, look_up);
 

next thing would be: is there always a '~' followed by a value in your array?

kind regards

[kigoobe]

Thanks for the update gits. Yes, actually that array_1 is a id~qnty pair (first id of the item to be selected, and then the quantity taken, starting from zero), so there's always the ~ sign, to seperate the two.

Idea is, user chooses a product for a particular category, choose number of that product, and then move to the next category. Problem that I was facing, was that when the user was moving to the next category, I was calling the same array, and it was already populated from before. So, I had to get rid of previous elements, in case the ids correspond to a different category, or keep it if it's from the same category.

OK, I'm updating my code.
Thanks again. :)

[gits]

ok ... so the snippet should do the job well now ;) ... post back in case you encounter problems with it ...

kind regards