JavaScript : Why is [1,2] + [3,4] = "1,23,4" in JavaScript?

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JavaScript : Why is [1,2] + [3,4] = "1,23,4" in JavaScript?
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JavaScript : Why is [1,2] + [3,4] = "1,23,4" in JavaScript?
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in JavaScript? = is [3,4] + "1,23,4" Why : JavaScript [1,2]



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