As far as I can tell, it seems that you can use the switch and if statements to achieve the same results. Am I missing something, or are they more or less interchangeabl
原因:在某些情况下,switch语句的性能可能不如多个if语句,特别是在编译器或解释器无法优化switch语句的情况下。 解决方法:对于性能敏感的代码,可以使用查找表(lookup table)或映射(map)来替代switch语句。例如,在 JavaScript 中可以使用对象字面量: 代码语言:txt ...
总之,在最坏的情况下,编译器也能生成与if-else相似的代码,而在最佳情况下,优化器可能会找到更好的方式生成代码。 总结 使用if-else-if: 需要进行条件语句而必须使用 需要判断的条件很少时,一般不超过5个 使用switch-case: 能用则用 参考资料 Advantage of switch over if-else statementIf…else…if vs switch...
ES.70: Prefer a switch-statement to an if-statement when there is a choice ES.70:进行选择时,switch语句比if语句好 Reason(原因) Readability. 可读性 Efficiency: A switch compares against constants and is usually better optimized than a series of tests in an if-then-else chain. 效率:switch语...
Adam, you are right. Unfortunately, Ayush removed his answer I was referring to. In his answer he basically stated that the switch statement is a "simple" version of the list if statements. This still hold true, so there's a good reason for the switch statement to exist: it simplicity ...
statement(s) else: # 如果条件为假,则执行这里的代码 statement(s) “` 3. if-elif-else语句:if-elif-else语句可以根据多个条件的真假来执行不同的代码块。它先判断第一个条件,如果条件为真,则执行对应的代码块;如果条件为假,则继续判断下一个条件,以此类推。最后,如果所有条件都为假,则执行else代码块。
功能: 将if 语句转换为 switch 语句或C# 8.0 switch 表达式。 使用时机: 最好将 if 语句转换为 switch 语句或 switch 表达式,反之亦然。 操作原因: 如果使用 if 语句,通过此重构可将其轻松转换为 switch 语句或 switch 表达式。 操作说明 请将光标置于 if 关键字。 按(Ctrl+.) 触发“快速...
The `if` and `switch` statements provide branching logic in C#. You use `if, `else` and `switch` to choose the path your program follows.
Also note that if you want to do more than one thing inside an if statement, you need to enclose it in curly braces. 1 2 3 4 5 if(something) { do_this(); do_that(); } vs 1 2 3 if(something) do_this_if_something_is_true(); this_will_run_either_way();// not inside if...
if (xOne == 0 || xTwo == 0) { switch (i) { case 0: if (((xOne == 0 && yOne == 0) || (xTwo == 0 && yTwo == 0))) System.out.println(i + " * - - - - - - - - - - - - - - - - - - -"); break; case 1: if (((...