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Convert columns to string in Pandas
...accidentally store a mixture of strings and non-strings in an object dtype array. It’s better to have a dedicated dtype.
object dtype breaks dtype-specific operations like DataFrame.select_dtypes(). There isn’t a clear way to select just text
while excluding non-text but still object-dtype colu...
What is JSONP, and why was it created?
...pt>
However this is a bit inconvenient, because we have to fetch this array from script tag. So JSONP creators decided that this will work better(and it is):
script = document.createElement('script');
script.type = 'text/javascript';
script.src = 'http://www.someWebApiServer.com/some-data?call...
YouTube iframe API: how do I control an iframe player that's already in the HTML?
... (Function) Function to call when the player is ready.
* @param Array args (optional) List of arguments to pass to function func*/
function callPlayer(frame_id, func, args) {
if (window.jQuery && frame_id instanceof jQuery) frame_id = frame_id.get(0).id;
var iframe = ...
When vectors are allocated, do they use memory on the heap or the stack?
...cator) also will be on the stack
No, vect will be on the stack, but the array it uses internally to store the items will be on the heap. The items will reside in that array.
vector<Type> *vect = new vector<Type>; //allocates vect on heap and each of the Type will be allocated on sta...
Append an object to a list in R in amortized constant time, O(1)?
...untime. To prevent that, this function implements a bare bones
# expanding array, in which list appends are (amortized) constant time.
expandingList <- function(capacity = 10) {
buffer <- vector('list', capacity)
length <- 0
methods <- list()
methods...
What exactly is Type Coercion in Javascript?
... that is not in the list is converted to true, including object, function, Array, Date, user-defined type, and so on. Symbols are truthy values. Empty object and arrays are truthy values as well:
Boolean({}) // true
Boolean([]) // true
Boolean(Symbol()) // true
!!Symbol...
Twitter's typeahead.js suggestions are not styled (have no border, transparent background, etc.)
...ction findMatches(q, cb) {
var matches, substringRegex;
// an array that will be populated with substring matches
matches = [];
// regex used to determine if a string contains the substring `q`
substrRegex = new RegExp(q, 'i');
// iterate through the pool of st...
Using mixins vs components for code reuse in Facebook React
...ur state's properties and store “error'd” properties in a state.errors array so you can highlight corresponding fields.
Source (gist)
define(function () {
'use strict';
var _ = require('underscore');
var ValidationMixin = {
getInitialState: function () {
return {
err...
What is the difference between _tmain() and main() in C++?
...ler doesn't enforce this for the main function, you get a program where an array of wchar_t strings are passed to the main function, which interprets them as char strings.
Now, in UTF-16, the character set used by Windows when Unicode is enabled, all the ASCII characters are represented as the pair...
Is there a typical state machine implementation pattern?
...ly got one state machine. Keep it outside the function and you can have an array of state machines with their own state.
– Vicky
Jun 25 '10 at 12:09
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