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Relationship between hashCode and equals method in Java [duplicate]
...hCode() and the instance of the key has been changed (for example a simple string that doesn't matter at all), the hashCode() could result in 2 different hashcodes for the same object, resulting in not finding your given key in map.get().
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IOS: verify if a point is inside a rect
... point to examine.
Return Value
true if the rectangle is not null or empty and the point is located within the rectangle; otherwise, false.
A point is considered inside the rectangle if its coordinates lie inside the rectangle or on the minimum X or minimum Y edge.
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Long vs Integer, long vs int, what to use and when?
... you to do some complex operations with integers (such as Integer.parseInt(String) )
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How do you search an amazon s3 bucket?
...solution:
Key name pattern search: Searching for keys starting with some string- if you design key names carefully, then you may have rather quick solution.
Search metadata attached to keys: when posting a file to AWS S3, you may process the content, extract some meta information and attach this m...
Differences between std::make_unique and std::unique_ptr with new
... unique_ptr<U>(new U())); // unsafe*
The addition of make_unique finally means we can tell people to 'never' use new rather than the previous rule to "'never' use new except when you make a unique_ptr".
There's also a third reason:
make_unique does not require redundant type usage. unique...
How do I change the language of moment.js?
...rope/London");
function to format date
const ISOtoDate = function (dateString, format='') {
// if date is not string use conversion:
// value.toLocaleDateString() +' '+ value.toLocaleTimeString();
if ( !dateString ) {
return '';
}
if (format ) {
return moment(dateString).forma...
Get all non-unique values (i.e.: duplicate/more than one occurrence) in an array
...can define the comparing function here.
// JS by default uses a crappy string compare.
// (we use slice to clone the array so the
// original array won't be modified)
let results = [];
for (let i = 0; i < sorted_arr.length - 1; i++) {
if (sorted_arr[i + 1] == sorted_arr[i]) {...
Update all values of a column to lowercase
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See http://dev.mysql.com/doc/refman/5.0/en/string-functions.html#function_lower
UPDATE table_name SET tag = LOWER(tag)
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How to insert in XSLT
...text disable-output-escaping="yes"> one. The latter is going to produce string literals like &nbsp; for all kinds of output, even for <xsl:output method="text">, and this may happen to be different from what you might wish... On the contrary, getting entities defined for XSLT template v...
How to count items in a Go map?
...Use len(m). From http://golang.org/ref/spec#Length_and_capacity
len(s) string type string length in bytes
[n]T, *[n]T array length (== n)
[]T slice length
map[K]T map length (number of defined keys)
chan T number o...