I want to simply exclude some array elements from another array and get the result using js and jQuery. I find my self doing a double .each() loop...
var exclude = new Array();
exclude = [1,2,3,4];
var original = new Array();
original = [0,1,2,3,4,5,6,7,8];
var finalarray = excludearrayfunction(original, exclude); // [0,5,6,7,8]
.not() methodYou can use the jQuery .not method to exclude items from a collection like so:
var exclude = [1,2,3,4];
var original = [0,1,2,3,4,5,6,7,8];
var result = $(original).not(exclude);
This will return us a jQuery object, to select the result as an array we can simply do:
var finalArray = result.get();
// result: 0,5,6,7,8
var exclude = [1,2,3,4];
var original = [0,1,2,3,4,5,6,7,8];
var finalArray = $(original).not(exclude).get();
var exclude = [1,2,3,4];
var original = [0,1,2,3,4,5,6,7,8];
var finalarray = $.grep(original,function(el,i) {
return !~$.inArray(el,exclude);
});
!~ is a shortcut for seeing if a value is equal to -1, and if $.inArray(el,exclude) returns -1, you know the value in the original array is not in the exclude array, so you keep it.
~ is a bitwise NOT operator which takes a value and flips each binary bit. we can use it in special cases like this because only ~(-1) returns 0, and !0 == true, so writing !~(x) is the same as (x) === -1Array.prototype.difference = function(arr) {
return this.filter(function(i) {return arr.indexOf(i) < 0; });
};
You don't need jQuery for this and its better for perf.
finalArray = [];
orig = [0,1,2,3,4,5,6,7,8];
exclude = [1,2,3,4];
orig.forEach(function(x) { if (exclude[x] === undefined) { finalArray.push(x) }});
//[0,5,6,7,8]
function excludearrayfunction(original, exclude) {
var temp = [];
$.each(original, function(i, val) {
if( $.inArray( val, exclude) != -1 ) {
temp.push(val);
}
});
return temp;
}
OR
function excludearrayfunction(original, exclude) {
return $.grep(original, function(i, val) {
return $.inArray(exclude, val) != -1;
})
}
Use jQuery's .not. You can find it here.
var original = [1,2,3];
var exclude = [1,2];
var tempArr = $(original).not(exclude);
var finalArray = tempArr .get();
