Questions & Help>Questions

File.stream vs File.read

#troubleshooting#help
newton-peixoto

newton-peixoto

File.stream vs File.read

Hello everyone

I am creating a CLI that implements the same functions as de WC CLI for unix system. I was able to achieve the expected result using File.read! but it loads everything into memory so I decided to use stream to solve the problem but somehow the results is different. Does anyone know what I missing here? Thanks

image
image1168×718 34.6 KB

12 comments
#help
2 634 12

Most Liked

hst337

hst337

File is 7145 lines long. Difference between results is 7145.
Explanation: File.stream! streams file line by line. Lines in files are separated by \n symbol. So File.read returns this symbol, while File.stream! doesn’t, and that is where the difference comes from.

Anyway, in your solution, you should stream file by bytes, but not by lines

2
Post #4

Where Next?

View thread on forum (has 12 responses!)
troubleshooting
help
Home Questions & Help>Questions
#troubleshooting#help
2 636 12
Last post

Popular in Questions Top

dotdotdotPaul
Questions & Help>Questions

Ecto: Validating belongs_to association is not nil?
Okay, I'm having a heck of a time trying to figure out how to best handle the validation of belongs_to associations in Ecto. I'm sure I'...
#ecto
29 17806 25
New
pmjoe
Questions & Help>Questions

What do you think of Gleam compared to Elixir?
I have a relationship of love and hate with Elixir. Lots of things are just absolutely right, but there are some things that are kind of ...
#programminguages#gleam
24 16555 10
New
jerry
Questions & Help>Questions

Ecto query using like/ilike in query
Good day to you all. I have been struggling to get a query involving like and ilike to work. Can anyone assist me on this, please? pro...
#ecto
17 16504 10
New
Harrisonl
Questions & Help>Questions

Deploying Elixir into ECS causing many "'global' at node :"xxxxx@10.0.X.X" requested disconnect from node :"xxxx@10.0.X.X" in order to prevent overlapping partitions"
We have an ECS cluster with 4 services, where each task joins a single cluster, via discovery ECS discovery service. Currently when I de...
#deployment
2 85219 3
New
minhajuddin
Questions & Help>Questions

Using List.first instead of Enum.at(0)
I have seen a lot of code which picks the first element from a list using Enum.at(0) instead of List.first. Is there a reason why people ...
#code-style
76 33273 14
New
rms.mrcs
Questions & Help>Questions

Transform a list into an map with indexes using Enum module
Hi, I need to transform a list of numbers into a map where the keys are the indexes and the values are the original values of the list....
35 32607 9
New
mathew4509
Questions & Help>Questions

Iterating through a list
I have a list say x = ["23gh", "56kh", "97mh"] I would like to pass each element to Val in each iteration. Say, in iteration 1 -------...
#book-programming-elixir#enumerables#enum#list
3 12090 5
New
LegitStack
Questions & Help>Questions

Websocket server in Elixir or phoenix
I’m trying to make a websocket server in Phoenix or raw Elixir. I heard about gun, I think I could use cowboy, but since I’m not that sma...
/phoenix#websockets
20 11315 8
New
WestKeys
Questions & Help>Questions

Mint vs Finch vs Gun vs Tesla vs HTTPoison etc
Currently suffering from paralysis by [HTTP client] analysis. This is rather unusual in Elixirland as there tends to be consensus on the ...
#http_client
252 21859 30
New
Qqwy
Questions & Help>Questions

Updating structs: Map.put vs %Foo{oldfoo | new: value} vs put_in
Original source of discussion: This topic on the Pragmatic Programmers' Functional Web Development with Elixir, OTP, and Phoenix forum. ...
#maps#structs#pipeline#access
115 28410 31
New

Other popular topics Top

Tee
Questions & Help>Questions

Enumerables - how does Enum.reduce work with maps
can someone please explain to me how Enum.reduce works with maps
#erlang
18 14675 13
New
vonH
Questions & Help>Questions

Why would I choose Elixir as a general purpose programming language?
In asking this question I am more interested about the expressiveness of the language itself and less concerned about the availability of...
#functional-programming#use-cases
65 34758 13
New
gshaw
Questions & Help>Questions

Idiomatic guard clause for checking not nil
What is the idiomatic way of matching for not nil in Elixir? E.g., First way: defp halt_if_not_signed_in(conn, signed_in_account) when...
#guard-clauses
13 43178 3
New
JorisKok
Questions & Help>Questions

How is it possible to get 2 million websocket connections when you have 65536 available ports?
I have a server on AWS, and was running a load test using artillery. When looking at the Phoenix dashboard I see the Ports going to 100% ...
/phoenix
20 17308 4
New
sergio
Learning Resources>Guides/Tuts/Tips/Info

Phoenix 1.6.0 LiveView + esbuild + Tailwind JIT + AlpineJS - A brief tutorial
I couldn’t find any guides that worked well with Phoenix 1.6.0 and esbuild. I hope this helps people test the waters and eases you into t...
/phoenix#liveview
137 17627 35
New
Patoshizzle
Questions & Help>Questions

(Postgrex.Error) FATAL 28P01 (invalid_password) password authentication failed for user “postgres”
After calling mix ecto.create I get this error: 17:00:32.162 [error] GenServer #PID<0.412.0> terminating ** (Postgrex.Error) FATAL...
#ecto#postgres#troubleshooting
10 28696 20
New
belgoros
Questions & Help>Questions

Regex question for hyphen match
I’m not a pro in using Regex and can’t figure out why the following behaviour happens, especially if we take into account the difference ...
#learning-elixir
9 12939 10
New
Qqwy
Questions & Help>Questions

Updating structs: Map.put vs %Foo{oldfoo | new: value} vs put_in
Original source of discussion: This topic on the Pragmatic Programmers' Functional Web Development with Elixir, OTP, and Phoenix forum. ...
#maps#structs#pipeline#access
115 28410 31
New
skosch
Questions & Help>Questions

Put/update deep inside nested maps (and auto-create intermediate keys)
To my knowledge, put_in, Map.update etc. all have the one limitation of not automatically creating intermediate keys when needed (for exa...
#data-structures#maps#immutability
52 20047 11
New
joeerl
Questions & Help>Questions

Upgrading Elixir - how to check versions, delete, and upgrade?
Hello again - after a longish gap I’ve decided I really must dig into Elixir and see what’s been happening here - so I have a few questio...
#upgrade
63 40940 13
New
Back to top

Questions & Help>Questions

Questions Questions ❯

Latest on Elixir Forum

Elixir Forum ❯

Sponsor Spotlight

Potions

The deployment platform built for Elixir: PaaS ease, VPS control.

Our Sponsors

Dashbit

Build Elixir applications with speed and confidence.

EEF

Supporting innovation across the BEAM ecosystem.

Coders51

We build reliable cloud platforms for business-critical systems.

AppSignal

Catch errors, track performance, monitor hosts and more.

Pragmatic Bookshelf

Practical resources that improve the lives of professional developers.

Manning

Develop your skills with books, videos, and courses.

Potions

The deployment platform built for Elixir: PaaS ease, VPS control.

Pragmatic Studio

Courses that'll move you from confusion to "Aha, now I get it!"

View all our sponsors ❯

Categories:

Sub Categories:

Forums

Our Sponsors

Dashbit

Build Elixir applications with speed and confidence.

EEF

Supporting innovation across the BEAM ecosystem.

Coders51

We build reliable cloud platforms for business-critical systems.

AppSignal

Catch errors, track performance, monitor hosts and more.

Pragmatic Bookshelf

Practical resources that improve the lives of professional developers.

Manning

Develop your skills with books, videos, and courses.

Potions

The deployment platform built for Elixir: PaaS ease, VPS control.

Pragmatic Studio

Courses that'll move you from confusion to "Aha, now I get it!"

View all our sponsors ❯

We're in Beta

About us Mission Statement