javascript - replace dash hyphen with a space

Question

I have been looking for this for a while  and while I have found many responses for changing a space into a dash  hyphen   I haven t found any that go the other direction   Initially I have   var str    This-is-a-news-item-     I try to replace it with   str replace  -           And simply display the result   alert str     Right now  it doesn t do anything  so I m not sure where to turn   I tried reversing some of the existing ones that replace the space with the dash  and that doesn t work either   Thanks for the help

User · Answer

var str    This-is-a-news-item-   while  str contains  -        str   str replace  -           alert str     I found that one use of str replace   would only replace the first hyphen  so I looped thru while the input string still contained any hyphens  and replaced them all   http   jsfiddle net LGCYF

User · Answer

This fixes it  let str    quot This-is-a-news-item- quot   str   str replace  - g        alert str    There were two problems with your code   First  String replace   doesn   t change the string itself  it returns a changed string  Second  if you pass a string to the replace function  it will only replace the first instance it encounters  That   s why I passed a regular expression with the g flag  for  global   so that all instances will be replaced

User · Answer

Imagine you end up with double dashes  and want to replace them with a single character and not doubles of the replace character   You can just use array split and array filter and array join   var str    This-is---a--news-----item----     Then to replace all dashes with single spaces  you could do this   var newStr   str split  -   filter function item      item   item   item replace  - g       item   return item     join         Now if the string contains double dashes  like  ----  then array split will produce an element with 3 dashes in it  because it split on the first dash    So by using this line   item   item   item replace  - g       item  The filter method removes those extra dashes so the element will be ignored on the filter iteration   The above line also accounts for if item is already an empty element so it doesn t crash on item replace   Then when your string join runs on the filtered elements  you end up with this output    This is a news item    Now if you were using something like knockout js where you can have computer observables   You could create a computed observable to always calculate  newStr  when  str  changes so you d always have a version of the string with no dashes even if you change the value of the original input string   Basically they are bound together   I m sure other JS frameworks can do similar things

User · Answer

In addition to the answers already given you probably want to replace all the occurrences  To do this you will need a regular expression as follows    str   str replace  - g            Replace all  -   with

User · Answer

I think the problem you are facing is almost this  -  str   str replace  -           You need to re-assign the result of the replacement to str  to see the reflected change   From MSDN Javascript reference  -     The result of the replace method is a copy of stringObj after the   specified replacements have been made    To replace all the -  you would need to use  g modifier with a regex parameter  -  str   str replace  - g

User · Answer

replace   returns an new string  and the original string is not modified   You need to do   str   str replace  - g

[javascript] javascript - replace dash (hyphen) with a space

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