I can't delete empty value of my String array

Question

I have a String array likes

var arr=["1","2",""];
arr.filter(Boolean);
arr.filter(function(e){return e != ""});

And I used one of these methods but that empty string still here. note: I'm using chrome.

Also note that the `filter()` method returns a new array, it doesn't work on the existing one by reference. As such you need to use `arr = arr.filter(...` — Rory McCrossan, Oct 17 '19 at 09:58
your code should work, just need to save array in a variable .. see below answers — Bhushan Kawadkar, Oct 17 '19 at 10:04
This works absolutely fine, as you can see in the snippet in [@BhushanKawadkar's answer](https://stackoverflow.com/a/58429975/519413). If it's not working *for you* then there must be another underlying problem. Please check the console for errors, and post a more complete example of your code. — Rory McCrossan, Oct 17 '19 at 10:07

score 2 · Answer 1 · answered Oct 17 '19 at 10:03

2

var arr=["1","2","", "3"];
//arr.filter(Boolean);
arr = arr.filter(function(num){return num!=""});
console.log(arr);

You have to assign it back to arr.

answered Oct 17 '19 at 10:03

Wils

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8
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score 2 · Answer 2 · answered Oct 17 '19 at 10:03

2

Your code is working, you just need to correct type retunr to return and save modified array to variable

var arr=["1","2",""];
console.log(arr);
arr.filter(Boolean);
arr = arr.filter(function(e){return e != ""});
console.log(arr);

answered Oct 17 '19 at 10:03

Bhushan Kawadkar

28,279
5
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your code should work as per code snippet i have posted. Did you see any console error? can you reproduce this on code snippet or jsfiddle so that i can take a look at it – Bhushan Kawadkar Oct 17 '19 at 10:07

score 1 · Answer 3 · answered Oct 17 '19 at 10:05

1

You have a typo (as @RoryMcCrossan sad), so the code must be:

var arr=["1","2",""];
var newArr = arr.filter(element => element !== "");

console.log(newArr);

answered Oct 17 '19 at 10:05

Simone Boccato

199
1
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score 0 · Answer 4 · answered Oct 17 '19 at 10:13

you can use arr.filter to filter a value. but if you are using IE then may be filter is not workng then you need to use pure javascript.

var arr=["1","2",""];
arr=arr.filter(function(o){ return o!=""});
console.log(arr);

output
(2) ["1", "2"]

var k=[];
for(var i=0;i<arr.length;i++){ if(arr[i]!=""){k.push(arr[i])}}
console.log(k);

I can't delete empty value of my String array

4 Answers4