micro-optimization
Is reading the `length` property of an array really that expensive an operation in JavaScript?
I always assumed caching the length of an array in JavaScript is a good idea (especially in the condition of a for loop) because of the expensiveness of calculating the length of an array.[详细]
2023-02-28 14:59 分类:问答Does adding local variables to methods make them slower?
This question has received a total of several paragraphs of answer. Here is the only sentence that actually tells me what I was looking for:[详细]
2023-02-28 10:07 分类:问答Java: if-return-if-return vs if-return-elseif-return
Asked an unrelated question where I had code like this: public boolean equals(Object obj) { if (this == obj)[详细]
2023-02-26 03:31 分类:问答For-loop Length Local Variable Micro Optimization?
In a lot of programming languages and their micro-opt开发者_如何学Goimizations, I\'ve seen that declaring the length of an array within a for-loop has performance implications especially in PHP and Ja[详细]
2023-02-23 08:47 分类:问答Micro-optimisation of keys versus in_array() in PHP
So you have the option to structure an array as you please knowing that a few lines further down in your code you are going to need to check for the existence of a value in that array. The way I see i[详细]
2023-02-22 14:31 分类:问答Why date() works twice as fast if we set time zone from code?
Have you noticed that date() function works 2x faster than us开发者_开发技巧ual if you set actual timezone inside your script before any date() call? I\'m very curious about this.[详细]
2023-02-22 01:29 分类:问答for loop or while loop which is faster? [duplicate]
This question already has answers here: Closed 12 years ago. Possible Duplicate: What loop is f开发者_开发知识库aster, while or for[详细]
2023-02-06 12:55 分类:问答Java - Declaring variables in for loops
Is declaring a variable inside of a loop poor practice? It would seem to me that doi开发者_StackOverflow中文版ng so, as seen in the first code block below, would use ten times the memory as the second[详细]
2023-01-31 20:50 分类:问答Efficient way to rotate a slice in golang
I need a function to efficiently rever开发者_开发问答se a slice in golang. (My concrete need is to reverse the prefix of a []byte).[详细]
2023-01-30 12:37 分类:问答PHP micro-optimization
How can开发者_运维知识库 I spot useless micro-optimization techniques? What should be avoided?Any optimization done without being measured and profiled first is useless.[详细]
2023-01-26 17:32 分类:问答