class Ameba::Rule::Performance::ChainedCallWithNoBang

Overview

This rule is used to identify usage of chained calls not utilizing the bang method variants.

For example, this is considered inefficient:

names = %w[Alice Bob]
chars = names
  .flat_map(&.chars)
  .uniq
  .sort

And can be written as this:

names = %w[Alice Bob]
chars = names
  .flat_map(&.chars)
  .uniq!
  .sort!

YAML configuration example:

Performance/ChainedCallWithNoBang:
  Enabled: true
  CallNames:
    - uniq
    - sort
    - sort_by
    - shuffle
    - reverse

Included Modules

Defined in:

ameba/rule/performance/chained_call_with_no_bang.cr

Constant Summary

ALLOCATING_METHOD_NAMES = ["keys", "values", "values_at", "map", "map_with_index", "flat_map", "compact_map", "flatten", "compact", "select", "reject", "sample", "group_by", "chunks", "tally", "merge", "combinations", "repeated_combinations", "permutations", "repeated_permutations", "transpose", "invert", "chars", "captures", "named_captures", "clone"] of ::String

All these methods are allocating a new object

MSG = "Use bang method variant `%s!` after chained `%s` call"

Constructors

Instance Method Summary

Instance methods inherited from module Ameba::AST::Util

abort?(node) abort?, control_exp_code(node : Crystal::ControlExpression, code_lines) control_exp_code, exit?(node) exit?, flow_command?(node, in_loop) flow_command?, flow_expression?(node, in_loop = false) flow_expression?, literal?(node) literal?, loop?(node) loop?, name_end_location(node) name_end_location, name_location(node) name_location, name_size(node) name_size, node_source(node, code_lines) node_source, raise?(node) raise?, source_between(loc, end_loc, code_lines) : String | Nil source_between

Instance methods inherited from class Ameba::Rule::Performance::Base

catch(source : Source) catch

Constructor methods inherited from class Ameba::Rule::Performance::Base

new(ctx : YAML::ParseContext, node : YAML::Nodes::Node)
new(config = nil) new

Instance methods inherited from class Ameba::Rule::Base

==(other) ==, catch(source : Source) catch, excluded?(source) excluded?, group group, hash hash, name name, special? special?, test(source : Source, node : Crystal::ASTNode, *opts)
test(source : Source) test

Class methods inherited from class Ameba::Rule::Base

parsed_doc parsed_doc

Constructor Detail

def self.new(ctx : YAML::ParseContext, node : YAML::Nodes::Node) #

This rule is used to identify usage of chained calls not utilizing the bang method variants.

For example, this is considered inefficient:

names = %w[Alice Bob]
chars = names
  .flat_map(&.chars)
  .uniq
  .sort

And can be written as this:

names = %w[Alice Bob]
chars = names
  .flat_map(&.chars)
  .uniq!
  .sort!

YAML configuration example:

Performance/ChainedCallWithNoBang:
  Enabled: true
  CallNames:
    - uniq
    - sort
    - sort_by
    - shuffle
    - reverse

def self.new(config = nil) #

This rule is used to identify usage of chained calls not utilizing the bang method variants.

For example, this is considered inefficient:

names = %w[Alice Bob]
chars = names
  .flat_map(&.chars)
  .uniq
  .sort

And can be written as this:

names = %w[Alice Bob]
chars = names
  .flat_map(&.chars)
  .uniq!
  .sort!

YAML configuration example:

Performance/ChainedCallWithNoBang:
  Enabled: true
  CallNames:
    - uniq
    - sort
    - sort_by
    - shuffle
    - reverse

[View source]

Instance Method Detail

def call_names : Array(String) #

def call_names=(call_names : Array(String)) #

def description : String #

def description=(description : String) #

def enabled : Bool #

def enabled=(enabled : Bool) #

def excluded : Array(String) | Nil #

def excluded=(excluded : Array(String) | Nil) #

def severity : Ameba::Severity #

def severity=(severity : Ameba::Severity) #

def test(source, node : Crystal::Call) #

[View source]
def test(source) #

[View source]