Hash#update() vs Hash#[]=

Author: Manjunath

README.md

@@ -859,6 +859,24 @@ Comparison:
  Hash#merge!: 10653.3 i/s - 2.66x slower
 ```
 
+##### `Hash#update` vs `Hash#[]=` [code](code/hash/update-vs-\[\]=.rb)
+
+```
+$ ruby -v code/hash/update-vs-\[\]=.rb
+ruby 2.6.6p146 (2020-03-31 revision 67876) [x86_64-darwin18]
+
+Warming up --------------------------------------
+ Hash#[]= 7.453k i/100ms
+ Hash#update 4.311k i/100ms
+Calculating -------------------------------------
+ Hash#[]= 74.764k (± 1.9%) i/s - 380.103k in 5.085962s
+ Hash#update 43.220k (± 0.8%) i/s - 219.861k in 5.087364s
+
+Comparison:
+ Hash#[]=: 74764.0 i/s
+ Hash#update: 43220.1 i/s - 1.73x (± 0.00) slower
+```
+
 ##### `Hash#merge` vs `Hash#**other` [code](code/hash/merge-vs-double-splat-operator.rb)
 
 ```

code/hash/update-vs-[]=.rb

@@ -0,0 +1,21 @@
+require 'benchmark/ips'
+
+ENUM = (1..100)
+
+def fast
+ ENUM.each_with_object({}) do |e, h|
+ h[e] = e
+ end
+end
+
+def slow
+ ENUM.each_with_object({}) do |e, h|
+ h.update(e => e)
+ end
+end
+
+Benchmark.ips do |x|
+ x.report('Hash#[]=') { fast }
+ x.report('Hash#update') { slow }
+ x.compare!
+end