Summary  
Strings are immutable; you cannot change individual characters in place and must create a new string (for example by concatenating parts of the old string with new content) to modify its value.

General domain of usage  
Text manipulation and processing

### Strings are Immutable:

Strings, in JavaScript, are immutable which means that their values cannot be changed once declared.

Let’s try to understand this with an example.

let  stringVariable = 'JavaScript';
// changing the value of first character.
stringVariable[0] = 'A';
console.log(stringVariable[0]);

The value did not change.

To do so, the usual practice is to create a new string variable with the value that we want to change and attach the parts of the older string to it. In this way, we can change the string,

let  str = 'Gi';
// replacing the string G with H
str = 'H' + str[1];
console.log(str);

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The syntax of the JavaScript programming language is the set of rules that defines how a JavaScript program will be written and interpreted (by both the runtime system and by human readers).

JavaScript is dynamically typed (also called loosely typed) scripting language. That is, in javascript variables can receive different data types over time. Datatypes are basically typed of data that can be used and manipulated in a program.

Strings 4/5

Strings are Immutable:

Solution

Strings 4/5

Strings are Immutable:

Solution