三元运算符react_三元运算符

朱雀 2022-12-06 15:44 231阅读 0赞

三元运算符react

The ternary operator "?:" earns its name because it's the only operator to take three operands. It is a [conditional operator][] that provides a shorter syntax for the if..then..else statement. The first operand is a boolean expression; if the expression is true then the value of the second operand is returned otherwise the value of the third operand is returned:

三元运算符“？：”之所以得名，是因为它是唯一接受三个操作数的运算符。 它是一个[条件运算符][conditional operator] ，可为if..then..else语句提供较短的语法。 第一个操作数是布尔表达式； 如果表达式为true，则返回第二个操作数的值，否则返回第三个操作数的值：

boolean expression? value1 : value2

## 例子： **(** Examples: **)** ##

The following if..then..else statement:

以下if..then..else语句：

boolean isHappy = true;
    String mood = "";
    if (isHappy == true)
    {
    mood = "I'm Happy!";
    }
    else
    {
    mood = "I'm Sad!";
    }

can be reduced to one line using the ternary operator:

可以使用三元运算符减少到一行：

boolean isHappy = true;
    String mood = (isHappy == true)?"I'm Happy!":"I'm Sad!";

Generally the code is easier to read when the if..then..else statement is written in full but sometimes the ternary operator can be a handy [syntax][] shortcut.

通常，如果完全编写if..then..else语句，则代码更易于阅读，但有时三元运算符可以是方便的[语法][syntax]快捷方式。

> 翻译自: [https://www.thoughtco.com/ternary-operator-2034302][https_www.thoughtco.com_ternary-operator-2034302]

三元运算符react

[conditional operator]: https://www.thoughtco.com/conditional-operator-2034056
[syntax]: https://www.thoughtco.com/source-code-definition-958200
[https_www.thoughtco.com_ternary-operator-2034302]: https://www.thoughtco.com/ternary-operator-2034302