- Pharo-users - lists.pharo.org

Re: [Pharo-users] Bloc of code in tiers programming language

by Hilaire

Le 15/05/2019 Ã 20:37, Konrad Hinsen a Ã©critÂ : > Lambda expressions are indeed Python's anonymous functions, but no > Python programmer would create a lambda expression only to assign it > to a variable. Doing this in an article to "sell" Smalltalk might well > have the opposite effect. Nor a Smalltalk programmer. Bellow the context for FYI. | sketch f df xn ptA ptB| sketch := DrGeoSketch new axesOn. xn := 2. f := [ :x | x cos + x ]. df := [ :x | (f value: x + 1e-8) - (f value: x) * 1e8]. "Derivate number" sketch plot: f from: -20 to: 20. ptA := (sketch point: xn@0) large; name: 'Drag me'. 5 timesRepeat: [ Â Â Â ptB := sketch point: [ :pt | pt point x @ (f value: pt point x)] parent: ptA. Â Â Â ptB hide. Â Â Â (sketch segment: ptA to: ptB) dotted forwardArrow . Â Â Â ptA := sketch point: [:pt | Â Â Â Â Â Â | x | Â Â Â Â Â Â x := pt point x. Â Â Â Â Â Â x - ( (f value: x) / (df value: x) )Â @ 0 ] parent: ptB. Â Â Â ptA hide. Â Â Â (sketch segment: ptB to: ptA) dotted forwardArrow]. -- Dr. Geo http://drgeo.eu

May 15, 2019

upload a stack trace with playground

by Roelof Wobben

Hello, I tried to upload a stack trace with playgroundÂ with upload to cloud but I see then a 400 bad request error message. I was a file of 3Kb. Is there a alternative so I can upload a stack trace. Roelof

May 15, 2019

Re: [Pharo-users] Bloc of code in tiers programming language

by Konrad Hinsen

Am 15.05.19 um 15:26 schrieb Atharva Khare: > I think in python, you use Lambda Expressions. Here is how I would do it > in python3: > import math > f = lambda x: math.cos(x) + x > d_f = lambda x: (f(x + 1e-8) - f(x)) * 1e8 Lambda expressions are indeed Python's anonymous functions, but no Python programmer would create a lambda expression only to assign it to a variable. Doing this in an article to "sell" Smalltalk might well have the opposite effect. Konrad.

May 15, 2019

Re: [Pharo-users] Bloc of code in tiers programming language

by TomaÅ¾ Turk

Here's a nice description about JS: https://www.vinta.com.br/blog/2015/javascript-lambda-and-arrow-functions/ Best wishes, Tomaz ------ Original Message ------ From: "Hilaire" <hilaire(a)drgeo.eu> To: pharo-users(a)lists.pharo.org Sent: 15.5.2019 18:54:58 Subject: Re: [Pharo-users] Bloc of code in tiers programming language >Hi, > >It is an important restriction on Python. So Javasctip has several way >of doing lambda, correct? > >Thanks > >Hilaire > >Le 15/05/2019 Ã 16:19, Richard O'Keefe a Ã©crit : >> One point worth making is that Python lambdas are artificially restricted: >> the body of a Python lambda may only be a single expression, not a >> sequence >> of statements. This restriction is for ideological reasons (the BDFL does >> not *want* you to do that) not for technical reasons. Lisp and Algol 68 >> were doing lambda expressions in the 60s. >> >> As well as function (x, y) { ... }, >> modern Javascript has (x, y) => .... >> with subtly different semantics. >> >-- >Dr. Geo >http://drgeo.eu > > >

May 15, 2019

Re: [Pharo-users] Bloc of code in tiers programming language

by Hilaire

Hi, It is an important restriction on Python. So Javasctip has several way of doing lambda, correct? Thanks Hilaire Le 15/05/2019 Ã 16:19, Richard O'Keefe a Ã©critÂ : > One point worth making is that Python lambdas are artificially restricted: > the body of a Python lambda may only be a single expression, not a > sequence > of statements.Â This restriction is for ideological reasons (the BDFL does > not *want* you to do that) not for technical reasons.Â Lisp and Algol 68 > were doing lambda expressions in the 60s. > > As well as function (x, y) { ... }, > modern Javascript has (x, y) => .... > with subtly different semantics. > -- Dr. Geo http://drgeo.eu

May 15, 2019

Re: [Pharo-users] Pharo download with wget

by BrunoBB

Hi, Thanks to all for information, this is finally fixed. On Centos 7.6 the fix is: sudo ln -s /usr/lib64/libcurl.so.4 /usr/lib64/libcurl-gnutls.so.4 In process i also executed (not sure if it had a direct impact on the fix): sudo yum install libgit2 regards, bruno -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

May 15, 2019

Re: [Pharo-users] Bloc of code in tiers programming language

by Hilaire

Thanks guys. -- Dr. Geo http://drgeo.eu

May 15, 2019

Re: [Pharo-users] Pharo download with wget

by BrunoBB

Sorry i forgot to mention Linux is Centos 7.6 regards, bruno -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

May 15, 2019

Re: [Pharo-users] Pharo download with wget

by BrunoBB

Ben, Thanks for the links, i will research further on this. Ted, libcurl is v4 [gemstone@localhost ~]$ locate libcurl.so /usr/lib64/libcurl.so /usr/lib64/libcurl.so.4 /usr/lib64/libcurl.so.4.3.0 regards, bruno -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

May 15, 2019

Re: [Pharo-users] Bloc of code in tiers programming language

by Richard O'Keefe

One point worth making is that Python lambdas are artificially restricted: the body of a Python lambda may only be a single expression, not a sequence of statements. This restriction is for ideological reasons (the BDFL does not *want* you to do that) not for technical reasons. Lisp and Algol 68 were doing lambda expressions in the 60s. As well as function (x, y) { ... }, modern Javascript has (x, y) => ... with subtly different semantics. On Thu, 16 May 2019 at 01:03, Hilaire <hilaire(a)drgeo.eu> wrote: > Hi, > > We, Smalltalkers, use bloc of code as easily as we breathe air. > > I am writing an article on Smalltalk programming for a French > mathematics teachers magazine. > > To illustrate the simplicity of Smalltalk, I would like to compare how > the bloc of code 'f' and 'df' below will be implemented in Javascript > and Python: > > > f := [ :x | x cos + x ]. > df := [ :x | (f value: x + 1e-8) - (f value: x) * 1e8]. > > Here f is a way to implement a function and df its derivate. > > Do some of you knows how it will be written in Javascript and Python > with their own ad-hoc anonymous function? > > Thanks > > Hilaire > > -- > Dr. Geo > http://drgeo.eu > > > >

May 15, 2019