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mu-hun/isEqualVariableArray.ts

Created May 1, 2020 10:30
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isEqualVariableArray.ts
const isEqual = <T extends number | string>(first: T[], second: T[]) =>
first.length === second.length &&
first.findIndex((item, index) => item !== second[index]) === -1;
const isEqualVariableArray = <T>(...arrays: T[][]) => arrays.slice(0, arrays.length - 1).findIndex((array, index) => !isEqual<T>(array, arrays[index+1]))
console.assert(isEqualVariableArray<number>([1, 2], [1, 2], [1, 2]))
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