Replacing spaces with underscores in JavaScript

Question

I m trying to use this code to replace spaces with    it works for the first space in the string but all the other instances of spaces remain unchanged  Anybody know why   function updateKey         var key     title   val        key key replace                   url key   val key

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I created JS performance test for it http   jsperf com split-and-join-vs-replace2

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Replace spaces with underscore    var str    How are you   var replaced   str split      join         Output  How are you

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To answer Prasanna s question below      How do you replace multiple spaces by   single space in Javascript     You would use the same function replace with a different regular expression   The expression for whitespace is  s and the expression for  1 or more times  is   the plus sign  so you d just replace Adam s answer with the following   key key replace   s  g

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try this   key key replace    g         that ll do a global find replace  javascript replace

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Try  replace    g         Edit  or  split      join      if you have an aversion to REs  Edit  John Resig said      If you re searching and replacing   through a string with a static search   and a static replace it s faster to   perform the action with    split  match   join  replace   -   which seems counter-intuitive but it   manages to work that way in most   modern browsers   There are changes   going in place to grossly improve the   performance of  replace  match g     replace   in the next version of   Firefox - so the previous statement   won t be the case for long

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I know this is old but I didn t see anyone mention extending the String prototype   String prototype replaceAll   function search  replace       if  search     replace  return this     if search entry or replace entry empty return the string     return this replace new RegExp       search         g    replace     global RegEx search for all instances   g   of your search entry and replace them all

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You can try this   var str    hello     world        str   str replace   s  g   -      It will even replace multiple spaces with single  -

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Try  replace    g         Edit  or  split      join      if you have an aversion to REs  Edit  John Resig said      If you re searching and replacing   through a string with a static search   and a static replace it s faster to   perform the action with    split  match   join  replace   -   which seems counter-intuitive but it   manages to work that way in most   modern browsers   There are changes   going in place to grossly improve the   performance of  replace  match g     replace   in the next version of   Firefox - so the previous statement   won t be the case for long

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try this   key key replace    g         that ll do a global find replace  javascript replace

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x000D   x000D  const updateKey   key   gt  console log key split      join        updateKey  Hello World    x000D   x000D   x000D

User · Answer

To answer Prasanna s question below      How do you replace multiple spaces by   single space in Javascript     You would use the same function replace with a different regular expression   The expression for whitespace is  s and the expression for  1 or more times  is   the plus sign  so you d just replace Adam s answer with the following   key key replace   s  g

User · Answer

You can try this   var str    hello     world        str   str replace   s  g   -      It will even replace multiple spaces with single  -

User · Answer

x000D   x000D  const updateKey   key   gt  console log key split      join        updateKey  Hello World    x000D   x000D   x000D

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Just using replace   x000D   x000D  var text    Hello World   x000D       x000D  new text   text replace            x000D       x000D  console log new text   x000D   x000D   x000D

User · Answer

Replace spaces with underscore    var str    How are you   var replaced   str split      join         Output  How are you

User · Answer

Try  replace    g         Edit  or  split      join      if you have an aversion to REs  Edit  John Resig said      If you re searching and replacing   through a string with a static search   and a static replace it s faster to   perform the action with    split  match   join  replace   -   which seems counter-intuitive but it   manages to work that way in most   modern browsers   There are changes   going in place to grossly improve the   performance of  replace  match g     replace   in the next version of   Firefox - so the previous statement   won t be the case for long

User · Answer

Try  replace    g         Edit  or  split      join      if you have an aversion to REs  Edit  John Resig said      If you re searching and replacing   through a string with a static search   and a static replace it s faster to   perform the action with    split  match   join  replace   -   which seems counter-intuitive but it   manages to work that way in most   modern browsers   There are changes   going in place to grossly improve the   performance of  replace  match g     replace   in the next version of   Firefox - so the previous statement   won t be the case for long

User · Answer

try this   key key replace    g         that ll do a global find replace  javascript replace

User · Answer

I created JS performance test for it http   jsperf com split-and-join-vs-replace2

User · Answer

I know this is old but I didn t see anyone mention extending the String prototype   String prototype replaceAll   function search  replace       if  search     replace  return this     if search entry or replace entry empty return the string     return this replace new RegExp       search         g    replace     global RegEx search for all instances   g   of your search entry and replace them all

User · Answer

try this   key key replace    g         that ll do a global find replace  javascript replace

User · Answer

Just using replace   x000D   x000D  var text    Hello World   x000D       x000D  new text   text replace            x000D       x000D  console log new text   x000D   x000D   x000D

[javascript] Replacing spaces with underscores in JavaScript?

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