字符串文字中的TypeScript空行

2vuwiymt 于 2022-11-26 发布在 TypeScript

关注(0)|答案(1)|浏览(161)

我想创建一个字符串文字，其可选值为numberOfResidents。

function mapBuildingToComment(building: Building) {
    return `
    ### Building information ###
    Street: ${building.address.street}
    HouseNumber: ${building.address.houseNumber}
    ${mapNumberOfResidents(building.numberOfResidents)}
    City: ${building.address.city}
    `
}

function mapNumberOfResidents(numberOfResidents?: string) {
    if (!numberOfResidents) return ''

    return `Number of residents: ${numberOfResidents}`
}

我现在的问题是，当numberOfResidents未定义时，输出中有一个空行。

Output:
    ### Building information ###
    Street: Teststreet
    HouseNumber: 1

    City: Test

如何做到没有空行，门牌号正下方是城市？

typescript

来源：https://stackoverflow.com/questions/74531653/typescript-empty-row-in-string-literal

1条答案

按热度按时间

yqhsw0fo1#

删除换行符，并仅在需要时添加它，如

function mapBuildingToComment(building: typeof b) {
    return `
    ### Building information ###
    Street: ${building.address.street}
    HouseNumber: ${building.address.houseNumber}\
${building.numberOfResidents ? '\n    ' + mapNumberOfResidents(building.numberOfResidents) : ''}
    City: ${building.address.city}
    `
}

function mapNumberOfResidents(numberOfResidents?: string) {
    if (!numberOfResidents) return ''

    return `Number of residents: ${numberOfResidents}`
}

const b = {address: {street: '123', houseNumber: 245, city: 'asd'}, numberOfResidents: '3'}
console.log(mapBuildingToComment(b))
b.numberOfResidents = ''
console.log(mapBuildingToComment(b))

另一个选择是从s.replaceAll(/\n\s+(?=\n)/g, '')结果中删除空行

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字符串文字中的TypeScript空行

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