javascript - Why does typeof NaN return 'number'? -



javascript - Why does typeof NaN return 'number'? -

just out of curiosity.

it doesn't seem logical typeof nan number. nan === nan or nan == nan returning false, way. 1 of peculiarities of javascript, or there reason this?

edit: answers. it's not easy thing ones head around though. reading answers , wiki understood more, still, sentence

a comparing nan returns unordered result when comparing itself. comparing predicates either signaling or non-signaling, signaling versions signal invalid exception such comparisons. equality , inequality predicates non-signaling x = x returning false can used test if x quiet nan.

just keeps head spinning. if can translate in human (as opposed to, say, mathematician) readable language, gratefull.

it means not number. not peculiarity of javascript mutual computer science principle.

from http://en.wikipedia.org/wiki/nan:

there 3 kinds of operation homecoming nan:

operations nan @ to the lowest degree 1 operand

indeterminate forms

the divisions 0/0, ∞/∞, ∞/−∞, −∞/∞, , −∞/−∞ the multiplications 0×∞ , 0×−∞ the powerfulness 1^∞ the additions ∞ + (−∞), (−∞) + ∞ , equivalent subtractions.

real operations complex results:

the square root of negative number the logarithm of negative number the tangent of odd multiple of 90 degrees (or π/2 radians) the inverse sine or cosine of number less −1 or greater +1.

all these values may not same. simple test nan test value == value false.

javascript

Comments

Post a Comment

Popular posts from this blog

iphone - Dismissing a UIAlertView -

iphone - Dismissing a UIAlertView - i set in app purchase app, , when user taps button, purchase started. basically, tap button, , depending on speed on net connection, waiting 10 seconds until new alert view comes asking if purchase product. user tap button multiple times since nil came up, , multiple purchase alert views come up. additionally, maybe seen user app bug. in end, problem. i want alert view come spinning wheel says "loading..." when users taps purchase button. problem is, how dismiss when new alert view comes asking user if want purchase product? if ([uialertview alloc] says: @"whatever apple's alert view says") { //dismiss "loading..." alert view here } i uncertainty work, input appreciated. thanks! you need have access alertview. can this. create alertview instance var in app delegate , when want show loading initialize instance var assign property , when want dismiss phone call [alertviewinstance d...
Read more

c# - Can ProtoBuf-Net deserialize to a flat class? -

c# - Can ProtoBuf-Net deserialize to a flat class? - protobuf-net uses nested protobuf constructs back upwards inheritance. however, can made force properties flat target class has same properties inherited "serialized" version? see test illustration below. needless result of flat namespace null both properties. possible solution: re-create info flat.b first on property property basis. note: not prefered option. using system; namespace hierarchy { using protobuf; [protocontract] public class { [protomember(1)] public string prop1 { get; set; } } [protocontract] public class b : { public b() { } [protomember(1)] public string prop2 { get; set; } public override string tostring() { homecoming "prop1=" + prop1 + ", prop2=" + prop2; } } } namespace flat { using protobuf; [protocontract] p...
Read more

javascript - Change element in each JQuery tab to dynamically generated colors -

javascript - Change element in each JQuery tab to dynamically generated colors - i'm using jquery ui tabs widget , have button add together additional tabs. i'm tying each tab markers on map coordinating randomly generated color using function gen_color() { homecoming '#'+(math.random()*0xffffff<<0).tostring(16); } so each tab has color corresponds number of markers of same color on map. i'm trying add together 15x15 block of color within tab's tab left of it's label. right i'm using tabtemplate alternative , trying alter when new tab added: $tabs = $("#tabs").tabs({ tabtemplate: "<li><span class='ui-icon-color' style='background-color:#000000;'></span><a href='#{href}'>#{label}</a> <span class='ui-icon ui-icon-close'>remove tab</span></li>", selected: 0, add: funct...
Read more