clear JavaScript array of elements

Question

clear JavaScript array of elements

I've been grappling with this issue for hours now, and it seemed so straightforward at first;

My goal with JavaScript is to iterate through an array, retrieve the current index value, and then remove that value from the array. I've read that splice() should be able to achieve this, but no matter what I try, I can't completely empty the array - there always seems to be one value left.

var filtered = array("up", "down", "left");
 function resetTags(){
       var length = filtered.length;

       for(i=0; i <= length; i++){
            filtered.splice(i,1);
        }
    }

EDIT::

Let me provide some additional context:

Essentially, my aim is to monitor a list of selected class values that are captured when an item is clicked: var filtered = array();

    jQuery("li a").click(function () {
     tag = jQuery(this).text();
     addFiltered(tag);
});

 function addFiltered(param){
      var inArray =  jQuery.inArray(param,filtered);
      if(inArray > -1){
        //param is in the array, so we need to remove it 
            filtered.splice(index, 1);
        });

        }else{
         //param isn't in the array, so we want to add it 
            filtered.splice(0, 0, param);
        });
        }


    }

javascript unset splice

Answer 1

Answer №1

To clear out the array entirely, just assign it to an empty array like this:

list = [];

If you need to access the values in the array before clearing it, loop through the array without removing any values and then reset it once finished.

Why complicate things with elaborate solutions when simplicity is the key?

Answer 2

To clear out the array entirely, just assign it to an empty array like this:

list = [];

If you need to access the values in the array before clearing it, loop through the array without removing any values and then reset it once finished.

Why complicate things with elaborate solutions when simplicity is the key?

Answer 3

Answer №2

There was an error in the definition of the array, causing the code to not execute properly.


var filtered = ["red", "blue", "green"];
function clearArray(){
    var size = filtered.length;

    for(j=0; j < size; j++){
        filtered.splice(j,1);
    }
}

Answer 4

There was an error in the definition of the array, causing the code to not execute properly.


var filtered = ["red", "blue", "green"];
function clearArray(){
    var size = filtered.length;

    for(j=0; j < size; j++){
        filtered.splice(j,1);
    }
}

Answer 5

Answer №3

If you want to eliminate items one at a time:

let b = [6,7,8,9,10];

while (b.length > 0 ) { b.splice(0,1); }

http://jsfiddle.net/65yJk/

Answer 6

If you want to eliminate items one at a time:

let b = [6,7,8,9,10];

while (b.length > 0 ) { b.splice(0,1); }

http://jsfiddle.net/65yJk/

Answer 7

Answer №4

So you've been increasing the values. Have you considered decreasing instead?

var filtered = new Array("high", "low", "middle");

function clearEntries(){
   var size = filtered.length;

   for(index = size; index >= 0; index--){
        filtered.splice(index,1);
   }
}

By doing this, you ensure that the last element is removed from the array.

Answer 8

So you've been increasing the values. Have you considered decreasing instead?

var filtered = new Array("high", "low", "middle");

function clearEntries(){
   var size = filtered.length;

   for(index = size; index >= 0; index--){
        filtered.splice(index,1);
   }
}

By doing this, you ensure that the last element is removed from the array.

Answer 9

Answer №5

My goal is to loop through an array, retrieve the current value at the index, and then remove that value from the array.

for(i=0; i <= length; i++){
            filtered.splice(i,1);
        }

It seems like you may not have a clear understanding of what you are trying to accomplish.

Are you attempting to create a method similar to pop(n) where:

var a = [1,2,3,4]
var result = pop(3, a)
result == [ 1, 2, 4]

Or are you simply looking to iterate through an array and remove the first element each time? If so, your approach might be incorrect. It sounds more like a job for shift()

 var filtered = ["up", "down", "left"]
 for(i = 0 ; i<= filtered.length; i++)
    {
       alert(filtered);
       filtered.shift();
       alert(filtered);          
    }

Answer 10

My goal is to loop through an array, retrieve the current value at the index, and then remove that value from the array.

for(i=0; i <= length; i++){
            filtered.splice(i,1);
        }

It seems like you may not have a clear understanding of what you are trying to accomplish.

Are you attempting to create a method similar to pop(n) where:

var a = [1,2,3,4]
var result = pop(3, a)
result == [ 1, 2, 4]

Or are you simply looking to iterate through an array and remove the first element each time? If so, your approach might be incorrect. It sounds more like a job for shift()

 var filtered = ["up", "down", "left"]
 for(i = 0 ; i<= filtered.length; i++)
    {
       alert(filtered);
       filtered.shift();
       alert(filtered);          
    }

clear JavaScript array of elements

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

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