How to convert instance of any type to string?

String(null) returns - "null"

String(undefined) returns - "undefined"

String(10) returns - "10"

String(1.3) returns - "1.3"

String(true) returns - "true"

I think this is a more elegent way.

value = value+"";

If targeting ES6 or later, you could use a template literal:

function (arg) {
    return `${arg}`;
}

I'm not sure you even need a function, but this would be the shortest way:

function( arg ) {
    return arg + '';
}

Otherwise this is the shortest way:

arg += '';

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