配列の中の値がユニークか調べるconst array1 = [1,2,3,1]; if (([...new Set(array1)]).length == array1.length) { console.log("unique"); } else { console.log("not unique"); } => not unique const array2 = [1,2,3]; if (([...new Set(array2)]).length == array2.length) { console.log("unique"); } else { console.log("not unique"); } => unique 参考https://stackoverflow.com/questions/9229645/remove-duplicate-values-from-js-array/9229821#9229821 |
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