I'm quite new concerning constructor functions.
For personal purposes, I'm making a script that extends the possibilities of the Date() object.
But when I create an object with new and asking for a specific property, all properties are processed (as I can see in the console actually). How to avoid that to save some resources ?
For example, if I do : var bisextile = new RightTime(2022).IsBisextile, I don't want RightTime().NextFullMoon being calculated.
Thanks
const RightTime = function(a,m,j,h,min) {
var getLunarAge = function(d,b,c) {
d = void 0 === a ? new Date() : new Date(d,b,c);
var b = d.getTime();
d = d.getTimezoneOffset();
b = (b / 86400000 - d / 1440 - 10962.6) / 29.530588853;
b -= Math.floor(b);
0 > b && (b += 1);
return 29.530588853 * b;
};
var woy = function(yy,mm,dd) {
var date = new Date(yy,mm-1,dd);
date.setDate(date.getDate() + 3 - (date.getDay() + 6) % 7);
var week1 = new Date(date.getFullYear(), 0, 4);
return 1 + Math.round(((date.getTime() - week1.getTime()) / 86400000 - 3 + (week1.getDay() + 6) % 7) / 7);
};
a || m || j || h || min ? (!m && (m = 1), !j && (j = 1), !h && (h = 0), !min && (min = 0), this.Now = new Date(a, m - 1, j, h, min)) : this.Now = new Date()
this.Day = this.Now.getDate();
this.DayInWeek = 0 == this.Now.getDay() ? 7 : this.Now.getDay();
this.DayInWeekName = days[this.DayInWeek];
this.Year = this.Now.getFullYear();
this.IsBissextile = ((this.Year % 4 === 0 && this.Year % 100 > 0) || (this.Year % 400 === 0));
this.Month = this.Now.getMonth() + 1;
// (...)
this.MoonAge = getLunarAge(this.Year, this.Month, this.Day);
this.NextFullMoon = this.MoonAge > 14.765294427 ? 44.29588328 - this.MoonAge : 14.765294427 - this.MoonAge;
this.NextNewMoon = 29.530588853 - this.MoonAge;
var mn = Math.round((this.MoonAge * 8) / 29.530588853)
// (...)
this.ShiftDays = function(n) {
let d = new Date(this.Year,this.Month-1,this.Day);
d.setDate(d.getDate() + n);
return d
}
}
You might utilize getter
Example
const RightTime = function(a,m,j,h,min) {
this.Now = new Date()
this.Year = this.Now.getFullYear();
Object.assign(this, {
get IsBissextile() {
return (this.Year % 4 === 0 && this.Year % 100 > 0) || (this.Year % 400 === 0)
}
})
}
const test = new RightTime();
console.log(test.IsBissextile);Or use modern class as Andy recommended
Example
class RightTime {
constructor(a,m,j,h,min) {
this.Now = new Date()
this.Year = this.Now.getFullYear();
this.Month = this.Now.getMonth() + 1;
}
get IsBissextile() {
return (this.Year % 4 === 0 && this.Year % 100 > 0) || (this.Year % 400 === 0)
}
get Zodiac() {
const zodiacEmote = {
12: "♐",
};
const month = this.Month;
return {
get Emote() {
return zodiacEmote[month];
}
}
}
}
const test = new RightTime();
console.log(test.IsBissextile);
console.log(test.Zodiac.Emote);As for the saving resources, I don't know how did you draw the conclusion but usually it would be better to run js profiler and see there potential culprits.