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 :

Answer 1

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.