JS foreach mea like me kaʻano

Pio Ka Mooolelo O hoʻolako ke hiki e hui pu iho aiaiiuo i ikehu lā a me ka mea. Komo ai i na kumu mua hiki ke lolouila Via indexes a me nā inoa ma ka pōʻaiapuni ana.

Akā, ia mea i mau mea hiki i ka ike i ka helu ana o hehee wale i loko o ka ohi i manao manawa a me ka meaʻaʻole manawa pono e hoʻohana i ka Ka Mooolelo O hoʻolako semantics i loko o ia mau mea.

Classic manao

Normal loop hoakaka "no (var ke = 0; I

var ke = 0;
ana, ... aData [nei] (typeof aData [e] = 'undefined'!); ... au ++; }

ka wā o ka helu ana o hehee mea IKE OLE IA.

E hiki no hoi kūkulu kekahi mau algorithms no iie a me ka hoʻouka aaioee, akā, ia mea nui oi pono e hoʻohana i ka hou, kēia Lolina.

Classic maikai ia oe Pono e kō ai ka palapala ninaninau HR (i kapaia, mua inoa, kulana), ka pepa no ka lako a (÷, Hookah, kuai, lā o ke kuai ana), a me nā ikepili i mea ole structurally hoʻololi i, a ho i ka huina hoihoi.

A hiki aku i ke kaua hehee ai i loko iho o ka mea a me nā hale i loaʻa kona mau waiwai a me epekema, hiki ole Makuakane me Classicʻano nui a me ka pono, a me ka lawe i kekahi manaʻo kū'ē.

Foreach loop

Nāʻano mea nui ka waiwai maoli hoike ana kū'ē hehee ai. Design JS foreach kaua, ma kekahi mau mea okoa, mai ka mau (hookama i loko o nā 'ōlelo'), mana, e leie aku iā mākou i ka i ka kaua o ka manawa, e hōʻike i ko lakou mau waiwai ma ka lā o kona hehee ai.

Ina kekahi e kū'ē i maupaʻa ke alanui (lākou qualitative a laupaʻi ano), a me kekahi e kū'ē i - kaa i hiki ke hele wale ma kekahi alanui, a iʻokoʻa ka leo wahie poʻina nalu, a laila i ka mamao ma waena o nā mea hoʻohui 'ē aʻe nui.

Ma ia heʻano pono algorithm e lawe i ke kumu, no kekahi laʻana, alanui, a koho i na kaa i e e hiki, e kipaku aku ia ia. A ia mea maikaʻi, ina ke alanui, a me nā kaʻa, e olelo ana ma o ka polokalamu i mea, "loaa ana ia lakou iho." Kēia mea he kumu noi o ka mea-aʻo i kaʻoihana iaaiey, a, i waena o nā mea a pau, aole ia e pono e hoʻololi i ka algorithm no ka hoʻololi 'ana i alanui a me kaʻa i hoiliili ole,' akomi compensates no ka alanui? Aiiio, kaʻa malama, a no laila, ma luna o

Technically ma JS foreach 'ole ka loa puni hoʻi: "aData.forEach (fData);", kahi fData - he papa i ua noi ai i kēlā me kēia hehee ai o ka hoʻonohonoho aData:

Launch fData (waiwai, 'inideka) {sText + =' inideka + '=' + waiwai + '; '; }.

Inā ke kumuʻikepili ua poe like penei:

var aData = [1,2,3,4];
aData.push (11);
aData.push (22);
aData.push (44);
aData.push ( 'laina 1');
aData.push ( 'laina 2');

var sText = '',

i ka hopena o ka pono JS foreach makemake:

"0 = 1 1 = 2 2 = 3 3 = 4 4 = 11; 5 = 22, 6 = 44, 7 = laina 1, 8 = laina 2;".

Hiʻona e kū'ē i mea

Mea ma Library - kupaianaha. Hoʻohana 'ana i nā mea ma luna o kēia' ōlelo mea me ka nui loa okoa mai implementations i loko o nā 'ōlelo a pau. Mea - i kēia i loko iho o ka kaua o ka waiwai a me epekema. A me ka mea hope nae hana i ka hana, e olaʻi a hoʻoponopono kona maʻiʻo 'ole' ē aʻe mawaho mea, huihui ikehu lā, aiaiiuo.

Na mea e hele mai ana i loko o ke kaua, e like me nā mōlina ma ka filmstrip, ka wā iterating ana ma JS foreach mea hale i hana i ka hou semantics: i manao ai ee iaaanu aey ano.

No laila, i ke alanui e iho hiki ke koho i kekahi kaʻa i hiki holo ma luna o ia mau mea, a me ka lā hope i wae 'loaʻa? Ooia. Inā 'oe e ole e lohe, i ka redundancy ma keia iaaiey koho hou ike loea kivila, i ka hana - e hooholo i ke ala o ka haawi - i JS foreach kūkulu i loko o ka manaʻoi a me ka alodio pāʻoihana:? Anoe? Ooia o nā alanui, koho i ka mīkini, a hooko i ka haawi ana o ka waiwai.

Inā? Ooia, alanui a me ka hana - huihui ikehu lā o nā mea, ke algorithm ua nui Nohie. Ka mea, i mea kupanaha e ka muli o JS foreach 'ole e like me ka lōʻihi lōʻihi ma ka hoi ana mai. Naʻe, hoʻowahāwahā i ka pono io o ka wahi, ma ka hoʻomaʻamaʻa ia mea paakiki e? Ii.

Hana JS foreach a me maoli nä mea

Manao kēia mea haku polokalamu hana me ka ninau i na mea no ka iaaiey, akā,ʻaʻole mea o ka mea maoli pilikia. Aʻole mau maopopo ia e ka poe o ke alanui kaʻa, i ke ala, i ka mamao ...

Mea-aʻo i kaʻoihana iaaiey Ua loli Hawaiʻi kukū mau kuamoo, a me ka mea maʻa mau i ua ia e hana i kekahi polokalamu mea kū'ē, ano, pihi, ala hele koho pahu, etc.

Eia hou kekahi, JS foreach a me nā 'ōlelo? Aiey iauaeoia ua hana i loko o ka malihini ka lako e lawe mai ma ka hoʻomaʻamaʻa nui hoʻokau'. I kela mea keia mea haku polokalamu Ua makaukau e kaʻana kona kuhi. Haʻi'ōlelo examples o ka pono o ka ikehu lā a me ka hoiliili ana o ka makemake mea - i ka aoao maikai e hoʻoikaika 'ana i ka naauao.

Naʻe, i ka loaʻa nui o pio ka pā'ālua no unintended hana nā mea haku polokalamu mai kaʻauhau'ēʻaʻe hopena ma luna o ka ulu ana o ka olelo mua iaʻi manaʻo no ka hōʻeuʻeu a me ka maoli-honua mea. JS foreach? Ieoaeunoai mea,ʻaʻole i hemolele, a me ka hooulu ana o ko lākou mau semantics mea e e loa i'ōlelo mai ai ka ao ao.