JavaScript_Succinctly

Boolean object via the Boolean() constructor, the value itself converts to true. In the
following sample, I demonstrate how a false Boolean object is always "truthy.”
Sample: sample54.html
var falseValue = new Boolean(false);
console.log(falseValue); // We have a false Boolean object, but objects
are truthy.
if (falseValue) { // Boolean objects, even false Boolean objects, are
truthy.
console.log('falseValue is truthy');
}
If you need to convert a non-Boolean value into a Boolean, just use the Boolean()
constructor without the new keyword and the value returned will be a primitive value
instead of a Boolean object.
Certain things are false, everything else is true
It has already been mentioned, but is worth mentioning again because it pertains to
conversions: If a value is 0, -0, null, false, NaN, undefined, or an empty string(""), it
is false. Any value in JavaScript except the aforementioned values will be converted to
true if used in a Boolean context (i.e. if (true) {};).
Sample: sample55.html
// All of these return a false Boolean value.
console.log(Boolean(0));
console.log(Boolean(-0));
console.log(Boolean(null));
console.log(Boolean(false));
console.log(Boolean(''));
console.log(Boolean(undefined));
console.log(Boolean(null));
// All of these return a true Boolean value.
console.log(Boolean(1789));
console.log(Boolean('false')); // 'false' as a string is not false the
Boolean value.
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