In this excerpt from javascript koans, what is the Array(foo+1) all about? -


the koan below. in lessons, i've never seen word "array" stuck code that. examples elsewhere can study?

it("should know properties functions act methods", function () {   var meglomaniac = {     mastermind : "brain",     henchman: "pinky",     battlecry: function (noofbrains)     {       return "they " + this.henchman + " , the" +       array(noofbrains + 1).join(" " + this.mastermind);     } };  var battlecry = meglomaniac.battlecry(4); expect(fill_me_in).tomatch(battlecry); });

it should know properties functions act methods. damaging karma.

expected 'fill value in' match 'they pinky , brain brain brain brain'.

so, array(noofbrains + 1) creates new array of length 5 (well, given noofbrains passed in 4), in every element undefined:

[undefined, undefined, undefined, undefined, undefined]

then, join operation takes string (" brain"), , places copy of between each element of array. (a more common use of join array.join(", ") comma-separates array)

so have:

undefined + " brain" + undefined + " brain" + undefined + " brain"+ undefined + " brain" + undefined

which becomes " brain brain brain brain", since undefined's ignored join.


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