示例#1
0
def count(iterable, pred=None):
    pred = Function(pred or utils.always(True), arity=1)
    return compatible.reduce(lambda n, _: n + 1, where(iterable, pred), 0)
示例#2
0
def first(iterable, pred=None, default=_undefined):
    pred = Function(pred or utils.always(True), arity=1)
    return where(iterable, pred).elementat(0, default)
示例#3
0
def last(iterable, pred=None, default=_undefined):
    pred = Function(pred or utils.always(True), arity=1)
    return reverse(iterable).first(pred, default)
示例#4
0
def takewhile(iterable, pred):
    pred = Function(pred or utils.always(True), arity=1)
    return itertools.takewhile(pred, iterable)