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This article focuses on "what are the solutions to optimize if-else", interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn "what are the solutions for optimizing if-else"?

Optimization plan 1: advance return to remove unnecessary else

If the if-else code block contains return statements, consider getting rid of the excess else by return in advance to make the code more elegant.

Before optimization:

If (condition) {/ / doSomething} else {return;}

After optimization:

If (! condition) {return;} / / doSomething

Optimization scheme 2: using conditional trinomial operators

Using the conditional trinomial operator can simplify some if-else and make the code more concise and readable.

Before optimization:

Int price; if (condition) {price = 80;} else {price = 100;}

After optimization:

Int price = condition?80:100

Optimization scenario 3: using enumerations

In some cases, enumerations can also be used to optimize if-else logical branches, which can also be seen as a table-driven approach, according to personal understanding.

Before optimization:

String OrderStatusDes; if (orderStatus==0) {OrderStatusDes = "order not paid";} else if (OrderStatus==1) {OrderStatusDes = "order paid";} else if (OrderStatus==2) {OrderStatusDes = "shipped";}.

After optimization: (define an enumeration first)

Public enum OrderStatusEnum {UN_PAID (0, "order not paid"), PAIDED (1, "order paid"), SENDED (2, "shipped"),; private int index; private String desc; public int getIndex () {return index;} public String getDesc () {return desc;} OrderStatusEnum (int index, String desc) {this.index = index This.desc = desc;} OrderStatusEnum of (int orderStatus) {for (OrderStatusEnum temp: OrderStatusEnum.values ()) {if (temp.getIndex () = = orderStatus) {return temp;}} return null;}}

With the enumeration, the above if-else logic branches can be optimized to one line of code:

String OrderStatusDes = OrderStatusEnum.0f (orderStatus). GetDesc ()

Optimization scenario 4: merge conditional expressions

If you have a series of conditions that return the same result, you can combine them into a conditional expression to make the logic clearer.

Before optimization:

Double getVipDiscount () {if (age

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