007Julien

It's a shame to choose, as you mentioned, a weird example for illustration !

The first example is on w3schools.com site !

I am not sure to understand the interest of this four variants ?

Calculation times are probably the same and probably much lower than reaction times of users.

Only the form, seems to favour the choice of solutions 2 or 4 ?

The only question is : Can we expect a change in the page of the site never to see this awful code ?

Fortunately that is not the Saints schedule!

This exemple is :

Date.prototype.myMet=function(){if (this.getMonth()==0){this.myProp="January"};if (this.getMonth()==1){this.myProp="February"};if (this.getMonth()==2){this.myProp="March"};if (this.getMonth()==3){this.myProp="April"};if (this.getMonth()==4){this.myProp="May"};if (this.getMonth()==5){this.myProp="June"};if (this.getMonth()==6){this.myProp="July"};if (this.getMonth()==7){this.myProp="August"};if (this.getMonth()==8){this.myProp="Spetember"};// With a typo for September !if (this.getMonth()==9){this.myProp="October"};if (this.getMonth()==10){this.myProp="November"};if (this.getMonth()==11){this.myProp="December"};} // Make a Date object, then call the myMet method:    var d = new Date();    d.myMet();    var monthname = d.myProp;// The result of monthname will be: August // It there not a better way to use an array with something like this ?Date.prototype.getLitteralMonth=function(){    return "January,February,March,April,May,June,July,August,September,October,November,December".split(',')[this.getMonth()];}alert(d.getLitteralMonth())

That is not scripting but writing guessing !

At least the proposed method has the merit to justify the numbering of months from 0 to 11 without imposing 12 unnecessary tests !

Since your site is very useful. Thanks...