CODEWITHSUNDEEP
dictionarytcl
Tk_
Tk_

Reputation: 123

Tcl: How to get value from nested dictionary by list of keys

I have difficulty accessing values in nested dictionary by using list of keys.

dict set testDict library [dict create NY [dict create section [dict create adult [dict create book cinderella]]]]
library {NY {section {adult {book cinderella}}}}
# I can access the value by:
dict get $testDict library NY section adult book
cinderella

# cannot access the same by list of keys in a variable
set keyLst {library NY section adult book}
library NY section adult book
set keyStr "library NY section adult book"
library NY section adult book

dict get $testDict $keyLst
key "library NY section adult book" not known in dictionary
dict get $testDict $keyStr
key "library NY section adults book" not known in dictionary

# The only not elegant solution I came up is using eval + list
eval dict get \$testDict $keyStr
key "adults" not known in dictionary

eval dict get \$testDict $keyLst
cinderella

While eval works in this instance - There must be better way to do this directly.

Any idea how to access nested dictionary values by key list in variable?

Upvotes: 1

Views: 3125

Answers (1)

Brad Lanam
Brad Lanam

Reputation: 5733

You need to expand the list (or string) into separate words. dict does not take a list as an argument.

dict get $testDict {*}$keyLst

References: dict ; argument expansion

Upvotes: 3

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