en.wikipedia.org/wiki/APL_(prog…
See : softwarepreservation.org/projects/apl/B…
![](https://pbs.twimg.com/media/DfaHe2iXcAAJrW-.jpg)
So before 2001, the `<-` was the standard (and only way) to assign value into a variable : developer.r-project.org/equalAssign.ht…
cran.r-project.org/src/base/NEWS.1
![](https://pbs.twimg.com/media/DfaH9p7W0AAF2N9.jpg)
google.github.io/styleguide/Rgu…
adv-r.had.co.nz/Style.html
![](https://pbs.twimg.com/media/DfaIX-rWsAYxe2R.jpg)
![](https://pbs.twimg.com/media/DfaIws-X4AAtdeF.png)
rud.is/b/2015/02/04/a…
![](https://pbs.twimg.com/media/DfaJG92XkAAtjnu.png)
![](https://pbs.twimg.com/media/DfaJYeMX4AAEFYb.png)
![](https://pbs.twimg.com/media/DfaJkQKW0AAJfd3.png)
![](https://pbs.twimg.com/media/DfaJ4zSXkAAcMJb.png)
![](https://pbs.twimg.com/media/DfaKlFoX0AEZ77K.png)
- blog.revolutionanalytics.com/2008/12/use-eq… by @revodavid
- stackoverflow.com/a/1742550/8236… by @richierocks
- stat.ethz.ch/R-manual/R-dev…
- ironholds.org/projects/rbitr…
![](https://pbs.twimg.com/media/DfaNawnX4AAJsDq.png)
![](https://pbs.twimg.com/media/DfbnXZZWkAAvdpv.png)