BoolUnit
BoolUnit is a type of Unit that only accepts boolean
data type as its value. It ensures that at any point of time the value would always be boolean
.
It implements non-deprecated Object.prototype methods like toString
and redirects them to the stored boolean
value inside the Unit, so when you call BoolUnit.toString()
, it'll be executed on the Unit's value instead of the BoolUnit instance itself. Similarly, when you call other Object.prototype
methods they are called on the stored value instead of BoolUnit instance.
See API reference for more details.
Default value
false
Value data type
boolean
BoolUnit vs boolean
boolean
BoolUnit can not be used as a drop-in replacement for primitive boolean
value, since BoolUnit is a non-primitive data structure, and the actual boolean
value is stored inside the Unit. See the below comparisons for more clarity.
// initialization
let bool = false; // a variable with prmitive boolean value
const unit = new BoolUnit({initialValue: false});
// initialValue is optional, BoolUnit has false as default value
bool === unit // false
bool === unit.value() // true
unit + '' // 'false'
unit + 1 // 1, because false is converted to 0
unit.dispatch(true);
unit + 1 // 2, because true is converted to 1
typeof bool === 'boolean' // true
typeof unit === 'object' // true
typeof unit.value() === 'boolean' // true
// value assignment
bool = true;
unit.dispatch(true);
// value access
console.log(bool) // logs true
console.log(unit.value()) // logs true
// or
unit.subscribe(value => console.log(value)) // logs true, will log future values
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