Documentation bug: http://groovy.codehaus.org/JN1035-Maps

At http://groovy.codehaus.org/JN1035-Maps

we read:

"We can also use the '' and '<<' operators to add elements to the map. Note that '<<' produces a new map while '' modifies the map:"

This should be

"We can also use the '' and '<<' operators to add elements to the map. Note that '=' produces a new map while '<<' modifies the map:"

as the program in the documentation (which is correct) illustrates:

def map4a = [:]
def map5a = map4a
assert map5a.is(map4a)
map4a << ['b':'b value'] // the map reference by map4a & map5a is extended
assert map5a.is(map4a)
map4a+= ['a':'a value'] // map4a is not the original map4a anymore
assert !map5a.is(map4a)
assert map4a == [b:'b value', a:'a value']
assert map5a == [b:'b value']