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Update 2.rst #166

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Update 2.rst #166

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Update 2.rst
Haceau-Zoac Feb 14, 2022
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Update 2.rst
Haceau-Zoac Feb 14, 2022
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Update 2.rst
Haceau-Zoac Feb 14, 2022
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7 changes: 6 additions & 1 deletion chp/2.rst
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Expand Up @@ -581,6 +581,7 @@ Haskell 不使用 ``return`` 关键字来返回函数值：因为一个函数就

::

ghci> :load myDrop.hs
[1 of 1] Compiling Main ( myDrop.hs, interpreted )
Ok, modules loaded: Main.

Expand Down Expand Up @@ -680,7 +681,7 @@ Haskell 不使用 ``return`` 关键字来返回函数值：因为一个函数就

def myDrop(n, elts):
while n > 0 and elts:
n = n -1
n = n - 1
elts = elts[1:]
return elts

Expand Down Expand Up @@ -832,6 +833,10 @@ Haskell 使用了另外一种求值方式 —— *非严格*\ 求值。在这种

*Main> :type (1 - 1) <= 0
(1 - 1) <= 0 :: Bool
*Main> 1 - 1
0
*Main> 0 <= 0
True

最终，我们得出了一个 ``True`` 值！

Expand Down