Elixir-将float转换为字符串 [英] Elixir - Convert float to string
问题描述
我试图弄清楚如何将浮点数转换为字符串/二进制,但看起来并不像看起来那么简单
I am trying to figure out how to convert a float to a string/binary but seems like its not as easy as it looks
iex(1)> to_string(1200.00)
"1.2e3"
iex(2)> Float.to_string(1200.00)
"1.2e3"
我们需要 1200.00出来...只是不使用指数符号
We need "1200.00" to come out...just not in the exponent notation
推荐答案
如果没有关于用例的更多详细信息,这将为您提供所需的结果:
Without further details about your usecase, this will give you your desired result:
iex(1)> Float.to_string(1200.00, decimals: 2)
"1200.00"
它使用的是erlang float_to_binary / 2
,将在elixir 1.4中弃用( https://github.com/elixir-lang/elixir/blob/v1.3.2/lib/elixir/lib/float.ex#L225 ):
It is using erlang's float_to_binary/2
and will be deprecated in elixir 1.4 (https://github.com/elixir-lang/elixir/blob/v1.3.2/lib/elixir/lib/float.ex#L225):
def to_string(float, options) do
:erlang.float_to_binary(float, expand_compact(options))
end
在Elixir 1.8中,仍然有 Float .to_string / 1
。已弃用 Float.to_string / 2
,建议直接使用:erlang.float_to_binary / 2
。
In elixir 1.8, there still is Float.to_string/1
. Float.to_string/2
is deprecated and the suggestion is to use :erlang.float_to_binary/2
directly.
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