[SOLVED] Custom JavaScript method to convert any datatype to Boolean

Question

I need a method to convert the data given by the user into Boolean.

The input comes in the form of numbers, number inside quotes and string.
Eg:
=> 0, 1, 2 (just for testing the method)
=> "0", "1", "2" (this is important)
=> "true", "false", "hello" (just for testing the method)

Result pattern:
"true", "false", "hello", "1", "2", 1, 2 => true
"0", 0 => false

But I'm missing something in my my code which giving unexpected output.
Help me to solve it.

https://code.sololearn.com/Wv3i2kbejIjo

Answer 1

When you go with `typeof this` inside an object prototype, `this` refers to the object itself rather than its underlying value. For this reason `typeof this` inside an object prototype gives `object`.

A web search showed me that we'd need to get object.constructor.name instead (it's a string). We can afterwards convert the string to lowercase and pass it into a `switch` for comparison.

Object.prototype.bool = function()
{
let typeID = this.constructor.name.toLowerCase();

switch(typeID)
{
case "number":
return Boolean(this != 0);

case "string":
if(!this.length) return false;
if(this == "false") return false;
let value = Number(this);
if(!isNaN(value)) return (value != 0);
return true;

default:
return Boolean(this);
}
}