Replace "iff" with "if and only if"

iff means if and only if, but readers without that knowledge might
assume this to be a spelling mistake. To me, this seems like
exclusionary language that is unnecessary. Simply using "if and only if"
instead should suffice.

6 files changed, 6 insertions, 6 deletions

diff --git a/spec/ruby/core/gc/disable_spec.rb b/spec/ruby/core/gc/disable_spec.rb
index b0221d8520..f89a9d2768 100644
--- a/spec/ruby/core/gc/disable_spec.rb
+++ b/spec/ruby/core/gc/disable_spec.rb
@@ -5,7 +5,7 @@ describe "GC.disable" do
     GC.enable
   end
 
-  it "returns true iff the garbage collection was previously disabled" do
+  it "returns true if and only if the garbage collection was previously disabled" do
     GC.enable
     GC.disable.should == false
     GC.disable.should == true
diff --git a/spec/ruby/core/gc/enable_spec.rb b/spec/ruby/core/gc/enable_spec.rb
index eb8d572f46..ca4488547a 100644
--- a/spec/ruby/core/gc/enable_spec.rb
+++ b/spec/ruby/core/gc/enable_spec.rb
@@ -2,7 +2,7 @@ require_relative '../../spec_helper'
 
 describe "GC.enable" do
 
-  it "returns true iff the garbage collection was already disabled" do
+  it "returns true if and only if the garbage collection was already disabled" do
     GC.enable
     GC.enable.should == false
     GC.disable
diff --git a/spec/ruby/core/hash/shared/eql.rb b/spec/ruby/core/hash/shared/eql.rb
index d8c33179fc..e294edd764 100644
--- a/spec/ruby/core/hash/shared/eql.rb
+++ b/spec/ruby/core/hash/shared/eql.rb
@@ -118,7 +118,7 @@ describe :hash_eql_additional, shared: true do
     { 1.0 => "x" }.send(@method, { 1 => "x" }).should be_false
   end
 
-  it "returns true iff other Hash has the same number of keys and each key-value pair matches" do
+  it "returns true if and only if other Hash has the same number of keys and each key-value pair matches" do
     a = { a: 5 }
     b = {}
     a.send(@method, b).should be_false
diff --git a/spec/ruby/core/integer/allbits_spec.rb b/spec/ruby/core/integer/allbits_spec.rb
index 11acb52e1f..edce4b15e7 100644
--- a/spec/ruby/core/integer/allbits_spec.rb
+++ b/spec/ruby/core/integer/allbits_spec.rb
@@ -1,7 +1,7 @@
 require_relative '../../spec_helper'
 
 describe "Integer#allbits?" do
-  it "returns true iff all the bits of the argument are set in the receiver" do
+  it "returns true if and only if all the bits of the argument are set in the receiver" do
     42.allbits?(42).should == true
     0b1010_1010.allbits?(0b1000_0010).should == true
     0b1010_1010.allbits?(0b1000_0001).should == false
diff --git a/spec/ruby/core/integer/anybits_spec.rb b/spec/ruby/core/integer/anybits_spec.rb
index 7e510fd00b..e0449074a2 100644
--- a/spec/ruby/core/integer/anybits_spec.rb
+++ b/spec/ruby/core/integer/anybits_spec.rb
@@ -1,7 +1,7 @@
 require_relative '../../spec_helper'
 
 describe "Integer#anybits?" do
-  it "returns true iff all the bits of the argument are set in the receiver" do
+  it "returns true if and only if all the bits of the argument are set in the receiver" do
     42.anybits?(42).should == true
     0b1010_1010.anybits?(0b1000_0010).should == true
     0b1010_1010.anybits?(0b1000_0001).should == true
diff --git a/spec/ruby/core/integer/nobits_spec.rb b/spec/ruby/core/integer/nobits_spec.rb
index b132a4a724..685759ffa3 100644
--- a/spec/ruby/core/integer/nobits_spec.rb
+++ b/spec/ruby/core/integer/nobits_spec.rb
@@ -1,7 +1,7 @@
 require_relative '../../spec_helper'
 
 describe "Integer#nobits?" do
-  it "returns true iff all no bits of the argument are set in the receiver" do
+  it "returns true if and only if all no bits of the argument are set in the receiver" do
     42.nobits?(42).should == false
     0b1010_1010.nobits?(0b1000_0010).should == false
     0b1010_1010.nobits?(0b1000_0001).should == false