Javascript Learning Boolean

constructor function

New Boolean (value)

constructor function

Boolean (value)

Conversion function parameter The value that is stored by the Boolean object or the value to be converted to a Boolean value returns worth as a constructor (with operator new) when called, Boolean () converts its arguments to a Boolean value, and returns a Boolean object that contains the value. If called as a function (without operator new), Boolean () only converts its arguments to a primitive Boolean value, and returns this value.

0, NaN, null, empty string "", and undefined are converted to false. Other primitive values, except false (including the string "false"), and other objects and arrays are converted to true.

The method toString () returns "true" or "false" based on the Boolean value represented by the Boolean object.

ValueOf () returns the original boolean value stored in the Boolean object.

Description in JavaScript, a Boolean value is a basic data type. A Boolean object is a Boolean object that packages a Boolean value.

The Boolean object is primarily used to provide a ToString () method that converts a Boolean value into a string.

When the ToString () method is called to convert a Boolean value to a string (typically called implicitly by JavaScript), JavaScript inherently converts the Boolean value to a temporary Boolean object and then calls the ToString () method of the object.

Grammar b.valueof ()

Returns the original Boolean value that the Boolean object B holds.

Grammar b.tostring ()

The return value returns the string "true" or "false" based on the value stored by the original Boolean or Boolean object B.

Javascript Learning Boolean