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How to tell Jackson to ignore a field during serialization if its value is null?
...t the attribute would be shown if the value is not null.
A more complete example is available in my answer to How to prevent null values inside a Map and null fields inside a bean from getting serialized through Jackson.
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Wrap long lines in Python [duplicate]
...atenated at compile time, just as in C. http://docs.python.org/reference/lexical_analysis.html#string-literal-concatenation is a good place to start for more info.
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TLSF源码及算法介绍 - 开源 & Github - 清泛网 - 专注C/C++及内核技术
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#ifndef _TLSF_H_
#define _TLSF_H_
#include <sys/types.h>
extern size_t init_memory_pool(size_t, void *);
extern size_t get_used_size(void *);
extern size_t get_max_size(void *);
extern void destroy_memory_pool(void *);
extern size_t add_new_area(void *, size_t, void *);
extern ...
What's the yield keyword in JavaScript?
... in JavaScript, but I found very poor documentation about it. Can someone explain me (or recommend a site that explains) its usage and what it is used for?
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How to get first record in each group using Linq
...er using the method 'FirstOrDefault' in this instance instead." from your example. Only operation on the list i did after the query was passing myResult.ToList() to a method. Using FirstOrDefault solved it though
– aghost
Feb 5 '16 at 10:38
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Flatten nested dictionaries, compressing keys
...lly the same way you would flatten a nested list, you just have to do the extra work for iterating the dict by key/value, creating new keys for your new dictionary and creating the dictionary at final step.
import collections
def flatten(d, parent_key='', sep='_'):
items = []
for k, v in d...
DataTrigger where value is NOT null?
...can make a setter that checks to see if a value is NULL and do something. Example:
12 Answers
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Mocha / Chai expect.to.throw not catching thrown errors
I'm having issues getting Chai's expect.to.throw to work in a test for my node.js app. The test keeps failing on the thrown error, but If I wrap the test case in try and catch and assert on the caught error, it works.
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How to enumerate a range of numbers starting at 1
...parameter so instead you could create two range objects and zip them:
r = xrange(2000, 2005)
r2 = xrange(1, len(r) + 1)
h = zip(r2, r)
print h
Result:
[(1, 2000), (2, 2001), (3, 2002), (4, 2003), (5, 2004)]
If you want to create a generator instead of a list then you can use izip instead.
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How to reorder data.table columns (without copying)
I'd like to reorder columns in my data.table x , given a character vector of column names, neworder :
2 Answers
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