A daily javascript learning summary (Boolean object)_javascript skills

Syntax for creating Boolean objects:
new Boolean(value); //Constructor
Boolean(value); //Conversion function
Parameter value The value stored by a Boolean object or the value to be converted into a Boolean value.
Return value
When called as a constructor (with operator new), Boolean() will convert its argument to a Boolean value and return a Boolean object containing the value.
If called as a function (without operator new), Boolean() will simply convert its argument to a primitive Boolean value and return this value.
Note: If the value parameter is omitted, or is set to 0, -0, null, "", false, undefined, or NaN, the object is set to false. Otherwise set to true (even if the value argument is the string "false").

  var falseObject = new Boolean(false);
  var result = falseObject && true;
  alert(result); //true

  var falseValue = false;
  result = falseValue && true;
  alert(result); //false
  
  alert(typeof falseObject); //object
  alert(typeof falseValue); //boolean
  alert(falseObject instanceof Boolean); //true
  alert(falseValue instanceof Boolean); //false

Boolean object description
In JavaScript, Boolean values ​​are a basic data type. A Boolean object is a Boolean object that packs a Boolean value. Boolean objects are mainly used to provide the toString() method that converts Boolean values ​​into strings.
When the toString() method is called to convert a Boolean value to a string (usually called implicitly by JavaScript), JavaScript will internally convert the Boolean value into a temporary Boolean object and then call the toString() method of this object. .

The above is today’s summary of JavaScript learning, and it will continue to be updated every day. I hope you will continue to pay attention.