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Haskell error parse error on input `='
...r below, you need a let to define things in it.
Prelude> let f x = x * 2
Prelude> f 4
8
Starting from GHC 8.0.1, top-level bindings are supported in GHCi, so OP's code will work without change.
GHCi, version 8.0.1.20161213: http://www.haskell.org/ghc/ :? for help
Prelude> f x = x * 2
P...
How do I completely uninstall Node.js, and reinstall from beginning (Mac OS X)
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28 Answers
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Parse a .py file, read the AST, modify it, then write back the modified source code
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12 Answers
12
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How can I get the external SD card path for Android 4.0+?
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26 Answers
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Bootstrap dropdown sub menu missing
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Updated 2018
The dropdown-submenu has been removed in Bootstrap 3 RC. In the words of Bootstrap author Mark Otto..
"Submenus just don't have much of a place on the web right now, especially the mobile web. They will be removed w...
What's the dSYM and how to use it? (iOS SDK)
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2 Answers
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Why are Perl 5's function prototypes bad?
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121
Prototypes aren't bad if used correctly. The difficulty is that Perl's prototypes don't work th...
How to get first and last day of the week in JavaScript
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20 Answers
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SQL - Update multiple records in one query
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Try either multi-table update syntax
UPDATE config t1 JOIN config t2
ON t1.config_name = 'name1' AND t2.config_name = 'name2'
SET t1.config_value = 'value',
t2.config_value = 'value2';
Here is SQLFiddle demo
or conditional update
UPDATE config
SET config_value = CASE con...
Determine if an HTML element's content overflows
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220
Normally, you can compare the client[Height|Width] with scroll[Height|Width] in order to detec...