Bacon also provides us ways to create constant properties. Constant properties are initialized at the time of creation and cannot be reinitialized, that is, new values cannot be pushed.
A constant property is created using the Bacon.constant() constructer. We need to pass the value of the property to the constructor. A constant property can be merged, concatenated, combined, zipped, sampled, filtered, and transformed.
Here is an example of how to create a constant property. Place this code in the index.js file:
var script_start_time = Bacon.constant(Date.now()).map(function(value){
var date = new Date(value);
return (date).getHours() + ":" + (date).getMinutes() + ":" + (date).getSeconds();
});
script_start_time.onValue(function(value){
console.log("This script started running at : " + value);
})Here, the constant property stores the time at which the script was started and prints the time.