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in the else if part of the toDate function there are two things argument and argstr. argstr is the internal class property of the argument.The line number 52 was argStr === "String" which doesn't make sense because argStr in a internal class property. Also in line number 43 argStr in compared to "[object Date]" which further explane that line number 52 should be typeof argument === "string". Also the line no.53 is argStr === "[object String]" which further explane that line no. 52 must be typeof argument === "string" because first of all we need to check if argument if of string or not and but the way argstr is by default returned as a string.