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Editorial Team
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Asked: 2026-06-11T19:24:05+00:00

a=new String(Hello); a[0]===H //true a[0]=J a[0]===J //false a[0]===H //true Does this mean I can

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a=new String("Hello");

String("Hello")

a[0]==="H" //true
a[0]="J"
a[0]==="J" //false
a[0]==="H" //true

Does this mean I can only use Strings as arrays of char’s by .split("") and then .join("")?

ANSWER: Yes, in Javascript strings are readonly (aka immutable) This question is answered here at:

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1 Answer

  1. Editorial Team

    Strings are immutable, so yes. a should be reassigned if you want to change the string. You can also use slice: a = 'j'+a.slice(1), or a replace: a = a.replace(/^h/i,'j').

    You could create a custom mutable String object, something like this experiment (esp. see method replaceCharAt).

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