第五十二节 高阶函数High Order Functions 前言 实践 前言 高阶函数的使用包含两种情况,一种是将另一个函数作为参数,另一种是返回一个函数。 实践 我们先来讲解第一种情况,一个函数将另一个函数作为参数。我们这里先定义两个函数,分别将一个字符串中的字母全部大写/小写: def Upper(text): return text.upper(...
My main concern is that in my functions, I wasn't quite clear concerning context, possibly. In order to reference vars declared in the init, one way I found that I could do it was to throw away the var statement, but I know it's best practice to always have them. Otherwise, I can...
x:pointX, y:pointY }); } } }); }); Now the trackball will be displayed, but we also need to hide it when the tooltip is removed. Therefore som extra functionality is also needed in the hide method. A new wrap is added inside the function containing the plugin: ...
calculate the text width at these positions incrementally, and correct the total column width in real time. (Because the total column width only needs to store the maximum value after the calculation, the calculated order of magnitude will be compressed to O(1)). ...
HIGHCHARTS_POOL_LISTEN_TO_PROCESS_EXITS: Set to false in order to skip attaching process.exit handlers. Logging config HIGHCHARTS_LOG_LEVEL: The log level (0: silent, 1: error, 2: warning, 3: notice, 4: verbose). HIGHCHARTS_LOG_FILE: A name of a log file. The --logDest also nee...
Reversing loop order is a common performance optimization in programming languages but generally isn’t very well understood. In JavaScript, reversing a loop does result in a small performance improvement for loops, provided that you eliminate extra operations as a result: //minimizing property ...
callback: Stringified JavaScript function to execute in the Highcharts constructor. customCode: Custom code to be executed before the chart initialization. This can be a function, code wrapped within a function, or a filename with the.jsextension. BothallowFileResourcesandallowCodeExecutionmust be...
In those cases, the Windows shell will send per-monitor DPI-aware application windows a new window message called WM_DPICHANGED. Inside your message handler, you can once again call the MonitorFromWindow and GetDpiForMonitor functions to get the effective DPI values for the current...
functions to get the effective DPI values for the current monitor and then simply update your Direct2D render target with its SetDpi method again. Alternatively, the message’s WPARAM packs both the x and y DPI values so this becomes a simple matter of extracting the low and high order ...
A powerful and simple node module of high order functions to execute synchronous tasks or asynchronous tasks. - aslamcode/tesk