javascript包括检查是否存在多个值[重复]

Question

const colors = ["black", "red", "pink", ];

这是colorsarray。我可以检查colors数组中是否存在一个值。例如，在这里，我想检查颜色数组中是否存在红色。我使用下面的代码。

Const IsRedExist = colors.includes("red"); //returns true

所以我想要一个标志来知道颜色数组中是否存在红色、白色或蓝色。我如何做到这一点？有什么建议吗？

Answer 1

所以你有一些和每一个与另一个数组。解决方案取决于你实际需要什么。

const colors = ["black", "red", "pink" ]

const checkFor = ["red", "white"]

const hasAll = checkFor.every(color => colors.includes(color))
const hasSome = checkFor.some(color => colors.includes(color))
const included = checkFor.filter(color => colors.includes(color))
const excluded = checkFor.filter(color => !colors.includes(color))
const checks = checkFor.reduce((obj, color) => ({[color]: colors.includes(color), ...obj}), {})

console.log('hasAll', hasAll)
console.log('hasSome', hasSome)
console.log('included', included)
console.log('excluded', excluded)
console.log('checks', checks, checks.red)