better yet, typeof initialValue !== 'undefined' so you avoid touching arguments at all
typeof initialValue !== 'undefined'
arguments
initialValue can be undefined
initialValue
undefined
yes...but accum = initialValue loses its purpose if it is.
accum = initialValue
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better yet,
typeof initialValue !== 'undefined'so you avoid touchingargumentsat allinitialValuecan beundefinedyes...but
accum = initialValueloses its purpose if it is.