1.2 KiB
1.2 KiB
| title |
|---|
| Boolean |
Boolean
The Boolean object is an object wrapper for a boolean (true or false) value. You can explicitly define a Boolean as new Boolean([value]). The optional value argument is converted to a boolean value. If value is not specified, 0, -0, null, false, NaN, undefined, or the empty string (""), the object is set to false. All other values, including any object or the string "false", create an object with a value of true. An interesting exception is when DOM's document.all is passed as an argument to the Boolean constructor, it is evaluated as false1.
Boolean primitive value (true and false ) is not same as Boolean object values (true and false).
More Information:
The Difference Between Boolean Objects and Boolean Primitives in JavaScript -- A Drip of JavaScript
Sources
- You Don't Know JavaScript, Chapter 4, line :364. Accessed on October 31, 2017.