/*

* Truthy and Falsy values and equality operators

*/

// falsy values: undefined, null, 0, '', NaN (Not a Number)

// truthy values: NOT falsy values

var height; // declare the height variable

height = 23; // initialise the height variable

if (height || height === 0) { // '===' no change

console.log('Variable is defined');

} else {

console.log('Variable has NOT been defined');

}

// Equality operators

if (height === '23') {

console.log('The == operator does type coercion!');

}