Or feed it through JSON.parse( JSON.strinigfy( o ) ) which will delete undefined things; doesn't help with null.
On Tue, Nov 28, 2017 at 5:50 PM, Michał Wadas <[email protected]> wrote: > You can just use proxy with proper set trap. > > On Wed, 29 Nov 2017 at 02:30, Rodrigo Carranza < > [email protected]> wrote: > >> A way to prevent properties to be added to an object if they are null or >> undefined. >> >> Currently this can be accomplished in many ways: >> >> With an if: >> ```js >> function foo(couldBeNull){ >> let ret = {} >> if(couldBeNull){ >> ret.couldBeNull = couldBeNull >> } >> return ret >> } >> ``` >> >> With ternary (kind of gross) >> ```js >> function foo(couldBeNull){ >> let ret = {} >> couldBeNull ? (ret.couldBeNull = couldBeNull) : null >> return ret >> } >> ``` >> >> Also gross >> ```js >> function foo(couldBeNull){ >> let ret = {} >> couldBeNull && (ret.couldBeNull = couldBeNull) >> return ret >> } >> ``` >> >> A bit hard to read: >> ```js >> function foo(couldBeNull){ >> let ret = { >> ...({couldBeNull} : {}) >> } >> return ret >> } >> ``` >> >> Requires importing a lib or writing the function by yourself. Also it has >> to iterate over all values >> ```js >> function foo(couldBeNull){ >> let ret = { >> couldBeNull >> } >> ret = removeEmptyValues(ret) // imported from some library >> return ret >> } >> ``` >> >> Wouldn't it be better something like this?: >> >> ```js >> function foo(couldBeNull){ >> let ret = { >> couldBeNull? >> } >> return ret >> } >> ``` >> >> Or if you want to set other property name >> >> ```js >> function foo(couldBeNull){ >> let ret = { >> bar ?: couldBeNull // bar is not added if couldBeNull is null or >> undefined >> } >> return ret >> } >> ``` >> >> >> <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient> >> Libre >> de virus. www.avast.com >> <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient> >> <#m_1540481831920124741_m_-273853769969316494_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> >> _______________________________________________ >> es-discuss mailing list >> [email protected] >> https://mail.mozilla.org/listinfo/es-discuss >> > > _______________________________________________ > es-discuss mailing list > [email protected] > https://mail.mozilla.org/listinfo/es-discuss > >
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