Julia: How to Replace Missing Values in A Data Frame

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This post is tested under Julia v1.6.1 and DataFrames v1.2.0.

A simple example:

using DataFrames
name = [“Julia”, “Mike”, “Tom”, “John”]
x = [2, missing, 4, missing]
y = [missing, 3, missing, 5]
df = DataFrame(:name => name, :var1 => x, :var2 => y)

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