booleans.js

/* 
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 Tutorial: Booleans in JavaScript
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*/
// Definition:-
// The boolean (not Boolean) is a primitive data type in JavaScript. It can have only two values: "true" or "false". 
// It is useful in controlling program flow using conditional statements.


// DECLARATION:-
var YES = true;

var NO = false;

// CHECK TYPE OF VARIABLE WITH "typeof" OPERATOR:-
console.log(typeof(YES)); //will print "boolean" in the console
console.log(typeof(NO)); //will print "boolean" in the console

// COMPARISION OPERATORS AND BOOLEANS:-
//The comparison expressions return boolean values to indicate whether the comparison is "true" or "false". 
//For example, the following expressions return boolean values.
var result = 1 > 2; //result stores "false"

// BOOLEAN FUNCTION:-
//JavaScript provides the Boolean() function that converts other types to a boolean type.
//The value specified as parameter to the Boolean() function  will be converted to a boolean value.
//The Boolean() will return "true" for any non-empty, non-zero, object, or array and will return "false" otherwise.

var x = Boolean("Hello"); // x stores "true"
var y = Boolean(10); // y stores "true"


/*
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 Challenge:-
 // 1. Check the boolean value of "0" and "-0" using the Boolean() function.
 // 2. Check the boolean value of "" (empty string) using the Boolean() function. 
 // 3. Check the boolean value of "[]" (empty array) using the Boolean() function. 
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*/