[英]What is the difference between == and === in Elixir?
I am starting out with Elixir. 我从Elixir开始。 I read that Elixir has weak equality
==
and strict equality ===
operator. 我读到Elixir具有弱等于
==
和严格等于===
运算符。
Coming from the JavaScript background, ==
feels like a big mistake. 来自JavaScript背景,
==
感觉像是一个大错误。 Is it any different in Elixir? Elixir有什么不同吗? Am missing something?
缺少什么吗? When should I use weak and strong operator respectively in Elixir?
我应该何时在Elixir中分别使用弱运算符和强运算符?
So far I know, In JavaScript "1" == 1
yields true
while in Elixir it yields false
. 到目前为止,我知道,在JavaScript中
"1" == 1
产生true
而在Elixir中则产生false
。 It means at least type information is preserved. 这意味着至少保留类型信息。 If this is so, then what is the use of weak equality?
如果是这样,那么弱平等的用途是什么?
According to the official documentation : 根据官方文件 :
The difference between
==
and===
is that the latter is more strict when comparing integers and floats:==
和===
之间的区别在于,在比较整数和浮点数时,后者更加严格:iex> 1 == 1.0 true iex> 1 === 1.0 false
Otherwise they're pretty much the same: 否则,它们几乎是相同的:
→ iex
Erlang/OTP 21 [erts-10.0] [source] [64-bit] [smp:4:4] [ds:4:4:10] [async-threads:1] [hipe]
Interactive Elixir (1.6.6) - press Ctrl+C to exit (type h() ENTER for help)
iex(1)> "bro" == "bro"
true
iex(2)> "bro" === "bro"
true
iex(3)> 1 == 1
true
iex(4)> 1.0 == 1.0
true
iex(5)> 1 == 1.0
true
iex(6)> 1 === 1.0
false
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