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Questions - nullable

Decouple multiple variable let in Kotlin

I have a separate function that applies different gradient based on specified id, this function returns a compose Brush. When I call this function in my boxscore I have to wrap with let since it retur...
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theblankishappy

android

kotlin

android-jetpack-compose

nullable

kotlin-null-safety

Votes: 0

Answers: 1

Latest Answer

I don't use Compose, so I'm not positive about this, but I would think you can move the contents of the second let block inside the first. When I have a let block with more than one line, I prefer to ...
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Tenfour04

fastparquet error when saving pandas df to parquet: AttributeError: module 'fastparquet.parquet_thrift' has no attribute 'SchemaElement

import pandas as pd from flatten_json import flatten actual_column_list = ["_id", "external_id", "email", "created_at","updated_at", "dob.timest...
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Dulshan

pandas

python-3.6

parquet

nullable

fastparquet

Votes: 0

Answers: 1

Latest Answer

Use fastparquet 0.7.2 Even though fastparquet 0.8.0 is compatible with python 3.6, looks like it requires a pyarrow version greater 5.0.0 to function properly. So had to downgrade fastparquet to 0.7.2...
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Dulshan

A nullable expression can't be used as a condition. A value of type 'bool?' can't be assigned to a variable of type 'bool'

I'm a beginner to flutter please someone help! Error: A value of type 'bool?' can't be assigned to a variable of type 'bool' because 'bool?' is nullable and 'bool' isn't. color: isDone ? Color(0xFF734...
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Mufasa

android

flutter

android-studio

dart

nullable

Votes: 0

Answers: 3

Latest Answer

Dart is a language which uses null safety. When you declaring bool? isDone; you are giving ? here. It means isDone boolean can be null ( It means it can contain null other than true or false ).So, whe...
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Aswanath C K

Non-nullable instance field 'id' must be initialized, Non-nullable instance field '_database' must be initialized. in flutter

could anyone help me with how to manage this problem? I am trying to code exactly likes the course's video, but I got this problem: I'm getting (Non-nullable instance field 'id' must be initialized. N...
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Ms one

database

flutter

initialization

nullable

Votes: 0

Answers: 1

Latest Answer

You have to put the null aware operator in the variables type for example: class Car { int? id; // <---- add a ? to int so it will be int? String? name; // <-- same here int? miles; // &...
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Wilson Toribio

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