Contents

describe "The '&&' statement" do
  it "short circuits evaluation at the first condition to be false" do
    x = nil
    true && false && x = 1
    x.should == nil
  end
  
  it "evaluates to the first condition not to be true" do
    ("yes" && 1 && nil && true).should == nil
    ("yes" && 1 && false && true).should == false
  end
  
  it "evaluates to the last condition if all are true" do
    ("yes" && 1).should == 1
    (1 && "yes").should == "yes"
  end
  
  it "evaluates the full set of chained conditions during assignment" do
    x = nil
    y = nil
    x = 1 && y = 2
    x.should == 2
  end
  
  it "treats empty expressions as nil" do
    (() && true).should == nil
    (true && ()).should == nil
    (() && ()).should == nil
  end
end

describe "The 'and' statement" do
  it "short-circuits evaluation at the first condition to be false" do
    x = nil
    true and false and x = 1
    x.should == nil
  end
  
  it "evaluates to the first condition not to be true" do
    ("yes" and 1 and nil and true).should == nil
    ("yes" and 1 and false and true).should == false
  end
  
  it "evaluates to the last condition if all are true" do
    ("yes" and 1).should == 1
    (1 and "yes").should == "yes"
  end
  
  it "when used in assignment, evaluates and assigns the expressions individually" do
    x = nil
    y = nil
    x = 1 and y = 2
    x.should == 1
  end
  
  it "treats empty expressions as nil" do
    (() and true).should == nil
    (true and ()).should == nil
    (() and ()).should == nil
  end
end

Version data entries

3 entries across 3 versions & 1 rubygems

Version	Path
opal-0.2.2	opals/opal/opal/spec/language/and_spec.rb
opal-0.2.0	opals/opal/opal/spec/language/and_spec.rb
opal-0.1.0	opals/opal/spec/language/and_spec.rb