toString() vs if

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Setup

const fileA = { version : "1.4" };

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Testing in
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toString
if(typeof fileA.version === "number" || typeof fileA.version === "string") {
    fileA.versionId = fileA.version.toString().split(".").map((num, idx) => num - (idx === 0 ? 1 : 0)).join(".");
}
ready
if
if(typeof fileA.version === "number") {
    fileA.versionId = fileA.version.toString().split(".").map((num, idx) => num - (idx === 0 ? 1 : 0)).join(".");
} else if(typeof fileA.version === "string") {
    fileA.versionId = fileA.version.split(".").map((num, idx) => num - (idx === 0 ? 1 : 0)).join(".");
}
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