Isonjululwe: ubude bento yejavascript

Ingxaki ephambili ngobude bento kukuba kunokuba nzima ukuqikelela ukuba into ethile iya kuba yinde kangakanani. Oku kunokukhokelela kwiingxaki xa uzama ukwaba imemori yento, okanye xa uzama ukufumana into ethile kwimemori.

The code below will return the length of an object:

Object.keys(obj).length

Le khowudi iya kubuyisela ubude bento. Object.keys(obj) izakubuyisela uluhlu lwezitshixo kwinto, kwaye .ubude buya kubuyisela inani lezinto kuloluhlu.

Izinto kwiJavaScript

KwiJavaScript, izinto ziyindlela yokuhlanganisa idatha enxulumeneyo kunye. Izinto zinokudalwa ngeendlela ezimbini: ngokusebenzisa igama elingundoqo elitsha, okanye ngokusebenzisa umsebenzi womakhi.

Ukwenza into usebenzisa igama elingundoqo elitsha, ungasebenzisa le syntax ilandelayo:

var obj = into entsha ();

Ukwenza into usebenzisa umsebenzi womakhi, ungasebenzisa le syntax ilandelayo:

var obj = into entsha (); obj.name = “uYohane”;

Iipropati zento

KwiJavaScript, izinto zineempawu ezinokufikelelwa kusetyenziswa umsebenzisi wamachaphaza (.). Umzekelo, ukufumana ixabiso lepropathi "igama" kwinto ethi "john" ongayisebenzisa:

john.igama

Ngokufanayo, ukufumana ixabiso lepropathi "ubudala" kwinto ethi "john" ongayisebenzisa:

john. ubudala

Izithuba ezihambelanayo:

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