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Showing content from https://webplatform.github.io/docs/javascript/Boolean/constructor below:

constructor Summary

Initializes a Boolean object.

Syntax

boolean.constructor([ value ])

boolean: Required. The name of the Boolean object being created
value: Optional. Specifies the value of the Boolean object. This can be the numbers 1 or 0, or the strings “true” or "false".

Examples

The following example illustrates the use of the constructor property.

var x = new Boolean("true");
 if (x.constructor == Boolean)
     document.write("Object is a Boolelan.");

Remarks

The constructor property contains a reference to the function that constructs instances of the Boolean object.