Fwd: Boolean equivalent to pre-increment and post-icnrement
# Sebastian Malton (6 years ago)
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# Steve Fink (6 years ago)
On 08/29/2018 12:13 PM, Bob Myers wrote:
In the stupid idea of the day department, for some reason I have felt the urge more than once in recent months for an operator which would invert the value of a boolean variable while evaluating to its pre-inversion value. For example:
if (bool!!) console.log("used to be true");The post-inversion case is less important since I can just write
if (bool = !bool).
There's always
if (counter++ & 1) console.log("used to be true"); if (++counter & 1) console.log("is now true");
or (counter++ % 2) if you prefer. And you get a free cycle counter in the bargain! (At the cost of flatlining to false at 2**53.)
In the stupid idea of the day department, for some reason I have felt the urge more than once in recent months for an operator which would invert the value of a boolean variable while evaluating to its pre-inversion value. For example:
if (bool!!) console.log("used to be true");The post-inversion case is less important since I can just write
if (bool = !bool).Bob
In the stupid idea of the day department, for some reason I have felt the urge more than once in recent months for an operator which would invert the value of a boolean variable while evaluating to its pre-inversion value. For example: ```js if (bool!!) console.log("used to be true"); ``` The post-inversion case is less important since I can just write `if (bool = !bool)`. Bob -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.mozilla.org/pipermail/es-discuss/attachments/20180830/f5ea9bc3/attachment.html>