# \[Video\] Achieving R's \`df1\[B\]= df2\[B\]\` with Julia multiple-dispatch

**URL:** <https://discourse.julialang.org/t/video-achieving-rs-df1-b-df2-b-with-julia-multiple-dispatch/45782>\
**Category:** Community\
**Created:** [August 30, 2020, 6:38am UTC](https://discourse.julialang.org/t/video-achieving-rs-df1-b-df2-b-with-julia-multiple-dispatch/45782 "2020-08-30T06:38:40Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![xiaodai](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/xiaodai/32/15937_2.png) [@xiaodai](https://discourse.julialang.org/u/xiaodai)\
**Post date:** [August 30, 2020, 6:38am UTC](https://discourse.julialang.org/t/video-achieving-rs-df1-b-df2-b-with-julia-multiple-dispatch/45782/1 "2020-08-30T06:38:40Z")

</div>

It was [asked on Twitter](https://twitter.com/bgreenwell8/status/1299439483042099200)

“Hey [#JuliaLang](https://twitter.com/hashtag/JuliaLang?src=hashtag_click), is it possibly to sunset a DataFrame using a logical/Boolean matrix like you can in [#rstats](https://twitter.com/hashtag/rstats?src=hashtag_click)? Anything close would be helpful!”

So I made a video to show how to do this in Julia

[![](https://global.discourse-cdn.com/julialang/original/3X/0/0/00503a74d003651af452531891c505d2bd97a839.jpeg "Making DF1[B] = DF2[B] work where B is a boolean array. A Julia's multiple-dispatch use-case") ](https://www.youtube.com/watch?v=CgyAgasFEHI)

and the Julia version is better.

This video is suitable for people learning Julia as well as it demonstrates some aspects of multiple-dispatch.