Dab tsi yog qhov reducer?
Dab tsi yog qhov reducer?

Video: Dab tsi yog qhov reducer?

Video: Dab tsi yog qhov reducer?
Video: Dr. Txawj teev vang - ๐Ÿ’˜๐Ÿ’ž๐Ÿ’ž Qhov Tseem ceeb Ntawm Kev cai Raus dej [ MV2 ~ 2022 ] 2024, Kaum ib hlis
Anonim

A reducer yog ib txoj haujlwm uas txiav txim siab hloov pauv rau daim ntawv thov lub xeev. Nws siv qhov kev txiav txim uas nws tau txais los txiav txim qhov kev hloov pauv no. Peb muaj cov cuab yeej, zoo li Redux, uas pab tswj cov ntawv thov lub xeev hloov pauv hauv ib lub khw kom lawv coj tus cwj pwm tsis tu ncua.

Kuj nug, dab tsi yog qhov reducer hauv programming?

Cov reducer yog ib txoj haujlwm ntshiab uas siv lub xeev tam sim no thiab ib qho kev nqis tes ua, thiab rov qab rau lub xeev tom ntej. Nco ntsoov tias lub xeev tau sau tseg vim tias txhua qhov kev txiav txim ntawm kev sau yog siv los hloov lub xeev no. Yog li muab ib phau ntawm kev ua, lub reducer yog siv rau txhua tus nqi ntawm kev sau (los ntawm sab laug mus rau sab xis).

Ib yam li ntawd, vim li cas peb thiaj li siv cov reducers hauv cov tshuaj tiv thaiv? Lub tswvyim ntawm a Reducer tau nrov hauv JavaScript nrog kev nce ntawm Redux raws li lub xeev kev tswj kev daws teeb meem rau Teb . Hauv paus reducers yog muaj los tswj lub xeev hauv ib qho daim ntawv thov . Piv txwv li, yog tias tus neeg siv sau ib yam dab tsi hauv HTML input teb, lub daim ntawv thov yuav tsum tswj hwm lub xeev UI no (piv txwv li cov khoom tswj hwm).

Ntawm no, dab tsi yog lub reducer rov qab?

Cov reducer yog ib tug ntshiab muaj nuj nqi uas yuav siv lub xeev yav dhau los thiab ib qho kev txiav txim, thiab rov qab los lub xeev tom ntej. Nws hu ua a reducer vim nws yog hom kev ua haujlwm koj yuav hla mus rau Array.

Dab tsi yog reducer hauv angular?

A reducer yog muaj nuj nqi nrog kos npe (accumulator: T, yam: U) => T. Reducers feem ntau siv hauv JavaScript los ntawm Array. txo txoj kev, uas iterates tshaj txhua array cov khoom thiab accumulates ib tug nqi raws li qhov tshwm sim. Reducers yuav tsum yog cov dej ntshiab huv, txhais tau tias lawv tsis tsim cov kev mob tshwm sim.

Pom zoo: