在 TypeScript 中将布尔值转换为数字

在 TypeScript 中将布尔值转换为数字

Convert a Boolean to a Number in TypeScript

使用该Number对象将布尔值转换为 TypeScript 中的数字，例如
const num = Number(true). 当用作函数时，Number(value)将值转换为数字。如果无法转换该值，则返回NaN（不是数字）。

const bool1 = true;

// 👇️ const num1: number
const num1 = Number(bool1);
console.log(num1); // 👉️ 1

const bool2 = false;

// 👇️ const num2: number
const num2 = Number(bool2);
console.log(num2); // 👉️ 0

我们使用
Number
函数将布尔值转换为数字。

true值为get converted to1和falsevalues get converted to的布尔值0。

You might also see developers use the
unary plus (+)
operator to convert a boolean to a number.

const bool1 = true;

// 👇️ const num1: number
const num1 = +bool1;
console.log(num1); // 👉️ 1

const bool2 = false;

// 👇️ const num2: number
const num2 = +bool2;
console.log(num2); // 👉️ 0

It achieves the same goal as the Number function, but might be confusing to
readers of your code who are not familiar with the unary plus (+) operator.

You should avoid using the unary plus (+) operator when adding numbers, because
it makes your code look quite strange.

const bool1 = true;
const bool2 = false;

const sum = +bool1 + +bool2;
console.log(sum); // 👉️ 1

The second plus is the addition operator and the other ones are used to convert
the boolean values to numbers.

Which approach you pick is a matter of personal preference. I’d go with using
the Number() function as it’s more explicit and makes your code easier to
read.