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並前往https://codereview.stackexchange.com/questions/177090/if-non-array-property-exists-convert-it-to-one-and-push-new-value/177091

If non-array property exists convert it to one and push new value

Basically after reading over the code, I interpret that the conditional (i.e. !obj[key].push ) checks if the value at the given key is not an array.

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