Delete part of string by index position

Question

How can I delete a part of a string by using only the index (no regex in case the character at index exists elsewhere)?

I use this, but it seems extremely convulted!!

var str = "stringIwant to delete from";
var stringCodeLastIndex = str.length - 1;
var index2delete = 1;
var stringStart, stringEnd, finalString;

if (index2delete == 0) {
    stringStart = "";
} else {
    stringStart = str.substr(0, index2delete);
}
if (index2delete < stringCodeLastIndex) {
    stringEnd = str.substr(index2delete + 1);
} else {
    stringEnd = "";
}
finalString = stringStart + stringEnd;

it could be one or more, here one. But my code has variable lengths. Does it make a difference? — EnglishAdam
– EnglishAdam, Commented Sep 18, 2014 at 9:45

georg · Accepted Answer · 2014-09-18 10:11:53Z

1

substring is smart enough to handle invalid indexes on its own:

str = "someXXXstring";
del = 4;
len = 3
str = str.substring(0, del) + str.substring(del + len);
document.body.innerText += str + ","

str = "somestringXXX";
del = 10;
len = 20
str = str.substring(0, del) + str.substring(del + len);
document.body.innerText += str + ","

str = "somestring";
del = 0;
len = 200
str = str.substring(0, del) + str.substring(del + len);
document.body.innerText += str + ","

edited Sep 18, 2014 at 10:11

answered Sep 18, 2014 at 9:48

georg

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3 Comments

EnglishAdam Over a year ago

Thanks, much cleaner than mine! What happens if the deleted string was ALL the string? returns "" right?

georg Over a year ago

@Gamemorize: yes, this is what it does.

EnglishAdam Over a year ago

maybe you could specify that var len is length of substring to be deleted. Anyways accepted!

evilpenguin · Accepted Answer · 2014-09-18 09:49:05Z

1

In your case, it's easier to use slice():

finalString = str.slice(0,index2delete)+str.slice(index2delete+1)

If you want to remove more characters, you can have 2 indexes:

finalString = str.slice(0,start_index)+str.slice(endindex+1)

http://www.w3schools.com/jsref/jsref_slice_string.asp

answered Sep 18, 2014 at 9:49

evilpenguin

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4 Comments

EnglishAdam Over a year ago

Thanks! Much cleaner than mine!

evilpenguin Over a year ago

You're welcome. Don't forget to approve one of the answers when you're done. Doesn't have to be mine. ;)

EnglishAdam Over a year ago

yeah, just trying to decide which is Cleanest!

EnglishAdam Over a year ago

Yours was just as clean, went with the answer with the fancy code running for ease of use for future visitors. Thanks though +1!

Abdul Jabbar · Accepted Answer · 2014-09-18 10:24:18Z

1

To remove one specific index from your string:

str.substr(0, indexToDelete) + str.substr(indexToDelete+1, str.length);

to remove a range of indexes from your string:

str.substr(0, startIndexToDelete) + str.substr(endIndexToDelete+1, str.length);

edited Sep 18, 2014 at 10:24

answered Sep 18, 2014 at 9:51

Abdul Jabbar

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3 Comments

evilpenguin Over a year ago

startIndexToDelete+endIndexToDelete ? Are you sure?

Abdul Jabbar Over a year ago

Yes it will remove characters between startindex and endindex

evilpenguin Over a year ago

@Abdul: No, it will not, this is a wrong solution. It will remove endIndexToDelete characters after startIndexToDelete. The correct version is str.substr(0, startIndexToDelete) + str.substr(endIndexToDelete+1, str.length) @Gamemorize: yes, it should return an empty string

Grégory Vorbe · Accepted Answer · 2014-09-18 10:12:42Z

0

var str = "stringIwant to delete from";
var index2delete = 1;
arStr = str.split(""); // Making a JS Array of each characters
arStr.splice(index2delete,1); // Using array method to remove one entry at specified index
var finalString = arStr.join(''); // Convert Array to String

Result :

sringIwant to delete from

fiddle

edited Sep 18, 2014 at 10:12

answered Sep 18, 2014 at 10:07

Grégory Vorbe

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2 Comments

evilpenguin Over a year ago

Allow me to comment that naming an array str is a bit confusing :)

Grégory Vorbe Over a year ago

@evilpenguin, You are allowed and I edited code accordingly, thx ;)

Gadawadara · Accepted Answer · 2014-09-18 09:49:23Z

-2

then create a substring and use replace('your substring', '') it will replace the part of your string with a empty space

answered Sep 18, 2014 at 9:49

Gadawadara

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1 Comment

EnglishAdam Over a year ago

as I said the regex (or replace) can-t be used! It would replace more than the specified index!

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