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added 1 character in body

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edited May 31 at 11:22

64.9k
3
65
154

Using Association and Merge

islis = {{"ab", 2, "c", 3}, {"d", 3, "e", 4}, {"ac", 5, "f", 6}, {"c", 7,
     "d", 8}, {"ad", 9, "c", 10}};
"a" /. Merge[Association[StringTake[#[[1]], 1] -> #] & /@ lis, 
  Identity]

gives:

{{"ab", 2, "c", 3}, {"ac", 5, "f", 6}, {"ad", 9, "c", 10}}

Using Association and Merge

is = {{"ab", 2, "c", 3}, {"d", 3, "e", 4}, {"ac", 5, "f", 6}, {"c", 7,
     "d", 8}, {"ad", 9, "c", 10}};
"a" /. Merge[Association[StringTake[#[[1]], 1] -> #] & /@ lis, 
  Identity]

gives:

{{"ab", 2, "c", 3}, {"ac", 5, "f", 6}, {"ad", 9, "c", 10}}

Using Association and Merge

lis = {{"ab", 2, "c", 3}, {"d", 3, "e", 4}, {"ac", 5, "f", 6}, {"c", 7,
     "d", 8}, {"ad", 9, "c", 10}};
"a" /. Merge[Association[StringTake[#[[1]], 1] -> #] & /@ lis, 
  Identity]

gives:

{{"ab", 2, "c", 3}, {"ac", 5, "f", 6}, {"ad", 9, "c", 10}}

Source Link

created May 31 at 10:26

ubpdqn

64.9k
3
65
154

Using Association and Merge

is = {{"ab", 2, "c", 3}, {"d", 3, "e", 4}, {"ac", 5, "f", 6}, {"c", 7,
     "d", 8}, {"ad", 9, "c", 10}};
"a" /. Merge[Association[StringTake[#[[1]], 1] -> #] & /@ lis, 
  Identity]

gives:

{{"ab", 2, "c", 3}, {"ac", 5, "f", 6}, {"ad", 9, "c", 10}}