node js string replace doesn t work

Question

var variableABC    A B C    variableABC replace  B    D     wanted output   A D C    but  variableABC  didn t change       variableABC    A B C    when I want it to be  A D C

User · Accepted Answer

According to the Javascript standard  String replace isn t supposed to modify the string itself  It just returns the modified string  You can refer to the Mozilla Developer Network documentation for more info    You can always just set the string to the modified value      variableABC   variableABC replace  B    D    Edit  The code given above is to only replace the first occurrence   To replace all occurrences  you could do    variableABC   variableABC replace  B g   D        To replace all occurrences and ignore casing   variableABC   variableABC replace  B gi   D

User · Answer

Isn t string replace returning a value  rather than modifying the source string   So if you wanted to modify variableABC  you d need to do this   var variableABC    A B C    variableABC   variableABC replace  B    D     output   A D C

User · Answer

If you just want to clobber all of the instances of a substring out of a string without using regex you can using       var replacestring    A B B C D      const oldstring    B       const newstring    E       while  replacestring indexOf oldstring   gt  -1            replacestring   replacestring replace oldstring  newstring                       result   A E E C D

User · Answer

Strings are always modelled as immutable  atleast in heigher level languages python java javascript Scala Objective-C     So any string operations like concatenation  replacements always returns a new string which contains intended value  whereas the original string will still be same

[string] node.js string.replace doesn't work?

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