📅  最后修改于: 2020-10-19 03:50:14             🧑  作者: Mango
决策结构要求程序员指定一个或多个要由程序评估或测试的条件,以及确定条件为真的情况下要执行的一条或多条语句,以及选择确定条件时要执行的其他语句。条件确定为假。
下面显示的是大多数编程语言中常见的典型决策结构的一般形式-
决策构造在执行指令之前评估条件。 TypeScript中的决策构造分类如下-
S.No. | Statement & Description |
---|---|
1. | if statement
An ‘if’ statement consists of a Boolean expression followed by one or more statements. |
2. | if…else statement
An ‘if’ statement can be followed by an optional ‘else’ statement, which executes when the Boolean expression is false. |
3. | else…if and nested if statements
You can use one ‘if’ or ‘else if’ statement inside another ‘if’ or ‘else if’ statement(s). |
4. | switch statement
A ‘switch’ statement allows a variable to be tested against a list of values. |