How to delete a specific one-dimensional array from two-dimensional array?

Question

I have project's function as follow: I have a two-dimensional array, then should delete the specific one-dimensional array. The two-dimensional array is:

//ID,Name,Age,Score.Student's ID is unique.

var arr1=[["1","aaa","20","90"],
      ["2","bbb","21","80"],
      ["3","ccc","22","70"], 
      ["4","ddd","23","60"],
     ];

var arr2=["3","ccc","22","70"];

I want to get the a two-dimensional array.The result as follow:

result=arr1=[["1","aaa","20","90"],
      ["2","bbb","21","80"],
      ["4","ddd","23","60"],
     ];

I write some codes,but I get a logic error.The URL of jsfiddle is:Edit fiddle

Thank you very much.

Just a tip: if your ID is unique, use a dictionary/object: it will make much quicker to find/add/delete new items. — MarcoL
– MarcoL, Commented Feb 26, 2014 at 15:23
@MarcoCI My workmate also suggest me to use the object, then implement the add or delete methods for this object.I will try do this later.Thank you — Lee Li
– Lee Li, Commented Feb 28, 2014 at 6:21

kamilkp · Accepted Answer · 2014-02-26 15:21:11Z

2

So you want to delete the array in arr1 with the ID correspoding to the ID in arr2? If thats the problem simply write:

for(var i=0;i<arr1.length;i++){
    if(arr1[i][0] === arr2[0])
        arr1.splice(i, 1);
}

http://jsfiddle.net/2pYT2/3/

answered Feb 26, 2014 at 15:21

kamilkp

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3 Comments

Stefano Ortisi Over a year ago

Actually in his answer he's comparing strings, not arrays

kamilkp Over a year ago

I'm not comparing arrays, I'm comparing strings i.e. elements from arrays.

Anthony Grist Over a year ago

Yeah, I misread that. That still seems wrong though, I think all of the elements in arr1[i] need to match arr2 to remove it, but perhaps I've also misunderstood the question.

Pavlo · Accepted Answer · 2014-02-27 09:30:21Z

0

Since you are using Underscore in your demo:

var result = _.filter(arr1, function (el) {
    return el[0] != arr2[0];
});

Updated demo: http://jsfiddle.net/2pYT2/4/

edited Feb 27, 2014 at 9:30

answered Feb 26, 2014 at 15:28

Pavlo

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Comments

Diode · Accepted Answer · 2014-02-26 15:47:19Z

You can use filter function of Array. See the code below, not tested but hope it helps.

This is to fix your current code. Better is solution is to convert two dimensional array to dictionary as MarcoCI suggested. It will help to you a lot.

var arr1 = [
    ["1", "aaa", "20", "90"],
    ["2", "bbb", "21", "80"],
    ["3", "ccc", "22", "70"],
    ["4", "ddd", "23", "60"], ];
var arr2 = ["3", "ccc", "22", "70"];




// filters comparing all elements
// use filterArray(sourceArray, array1, array2, array3 ...)
function filterArray(arr) {
    var args = arguments;
    return arr.filter(function (x) {
        for (var i = 1; i < args.length; i++) {
            var tarr = args[i];
            for (var j = 0; j < tarr.length && j < x.length; j++) {
                if (tarr[j] != x[j]) {
                    return true;
                }
            }
        }
        return false;
    });

}

console.log(filterArray(arr1, arr2));

// filters comparing 0th element
// use filterArrayID(sourceArray, array1, array2, array3 ...)
function filterArrayID(arr) {
    var args = arguments;
    return arr.filter(function (x) {
        for (var i = 1; i < args.length; i++) {
            var tarr = args[i];
            if (tarr[0] != x[0]) {
                return true;
            }
        }
        return false;
    });

}

console.log(filterArrayID(arr1, arr2));

fiddle : http://jsfiddle.net/2pYT2/5/

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