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Boolean
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[Boolean][mdn-boolean] constructor.
bash
npm install @stdlib/boolean-ctor
javascript
var Boolean = require( '@stdlib/boolean-ctor' );
#### Boolean( value )
Returns a Boolean object, which is an object wrapper for a primitive boolean value.
javascript
var b = new Boolean( null );
// returns <Boolean>
When invoked without new, the function converts an input value to a primitive boolean value.
javascript
var b = Boolean( null );
// returns false
*
### Methods
##### Boolean.prototype.toString()
Returns a string representation of the boolean value.
javascript
var b = new Boolean( true );
var str = b.toString();
// returns 'true'
##### Boolean.prototype.valueOf()
Returns the primitive value of the boolean object.
javascript
var b = new Boolean( true );
var val = b.valueOf();
// returns true
b = new Boolean();
val = b.valueOf();
// returns false
new,
- if provided false, null, undefined, -0, 0, NaN, or an empty string, the function returns false.
- if provided any other value, including an empty object, an empty array, the string 'false', or a Boolean object (including a Boolean object whose value is false), the function returns true.
- When invoked with new, the value of the returned Boolean object adheres to the same conversion semantics as when the constructor is invoked without new.
javascript
var format = require( '@stdlib/string-format' );
var Bool = require( '@stdlib/boolean-ctor' );
var values = [
'5',
5,
0,
NaN,
true,
false,
null,
void 0,
[],
{}
];
var i;
for ( i = 0; i < values.length; i++ ) {
console.log( format( '%s => %s', JSON.stringify( values[ i ] ), ( Bool( values[ i ] ) ) ? 'true' : 'false' ) );
}
