The toString() method returns a string representing the specified object.
str.toString()
The String object overrides the toString() method of the Object object; it does not inherit Object.prototype.toString(). For String objects, the toString() method returns a string representation of the object and is the same as the str.valueOf() method.
toString()The following example displays the string value of a String object:
var x = new String('Hello world');
console.log(x.toString()); // logs 'Hello world'
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