メモ
function isInteger(x) {
return Math.round(x) === x;
}
> isInteger(1)
true
> isInteger(0)
true
> isInteger(1.111)
false
> isInteger("1")
false
> isInteger("")
false
> isInteger(null)
false
> isInteger(NaN)
false
> isInteger(undefined)
false
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