Answered
Remove Duplicate Items from Array
I frecuently receive information from customers (image below)
I need to remove duplicate numbers
How can I create a new array without duplicated items
any help will be appreciate
This topic has been closed for replies.
Oops. Thanks for the catch.
What about
function removeDuplicate(a) {
for (var i = a.length-1; i > -1; i--) {
for (var j = 0; j < a.length; j++) {
if (i != j && a[i] == a[j]) {
a.splice(j, 1);
}
}
}
return a;
}
var array1 = [2, 3, 1, 2, 2, 1, 3, 3, 2];
var array2 = removeDuplicate(array1);
alert( array2 ); // 1,3,2
Alternatively
function removeDuplicate(a){
var b = [];
for (var i = 0; i < a.length; i++) {
var duplicate = (function () {
for (var j = 0; j < b.length; j++) {
if (b[j] == a[i]) {
return true;
}
}
return false;
} () );
if (!duplicate) {
b.push(a[i])
}
}
return b;
}
var array1 = [2, 3, 1, 2, 2, 1, 3, 3, 2];
var array2 = removeDuplicate(array1);
alert( array2 ); // 2,3,1
I usually make a "map", meaning adding each array value to an object. Since you can't have duplicate object keys, each duplicate value would replace it's previous value if it already exists
var map = {};
var arr = [1,2,3,1,2,3];
for (var a=0; a<arr.length; a++) {
map[arr[a]] = arr[a]; // {"1":1, "2":2, "3":3}
}
var unique = [];
for (var b in map) {
unique.push(map[b]);
}
alert(unique);
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