London | Samira Hekmati | Module Tools | Week 2 | jq

jq/scores.json

@@ -1 +1,8 @@
-[{"name": "Ahmed", "city": "London", "scores": [1, 10, 4]}, {"name": "Basia", "city": "London", "scores": [22, 9, 6]}, {"name": "Mehmet", "city": "Birmingham", "scores": [3, 12, 17]}, {"name": "Leila", "city": "London", "scores": [1]}, {"name": "Piotr", "city": "Glasgow", "scores": [15, 2, 25, 11, 8]}, {"name": "Chandra", "city": "Birmingham", "scores": [12, 6]}]
+[
+  { "name": "Ahmed", "city": "London", "scores": [1, 10, 4] },
+  { "name": "Basia", "city": "London", "scores": [22, 9, 6] },
+  { "name": "Mehmet", "city": "Birmingham", "scores": [3, 12, 17] },
+  { "name": "Leila", "city": "London", "scores": [1] },
+  { "name": "Piotr", "city": "Glasgow", "scores": [15, 2, 25, 11, 8] },
+  { "name": "Chandra", "city": "Birmingham", "scores": [12, 6] }
+]

jq/script-01.sh

@@ -5,3 +5,13 @@ set -euo pipefail
 # The input for this script is the person.json file.
 # TODO: Write a command to output the name of the person.
 # Your output should be exactly the string "Selma", but should not contain any quote characters.
+
+
+echo "first solution using cat command and pipeline:"
+cat person.json | jq '.name'
+
+echo ""
+
+echo "second solution using jq only:"
+jq '.name' person.json
+

jq/script-02.sh

@@ -5,3 +5,16 @@ set -euo pipefail
 # The input for this script is the person.json file.
 # TODO: Write a command to output the address of the person, all on one line, with a comma between each line.
 # Your output should be exactly the string "35 Fashion Street, London, E1 6PX", but should not contain any quote characters.
+
+#note to self:
+# What Each Part Does
+# jq → Calls the jq tool.
+# -r → Removes quotes from the output (so the result is a plain string, not JSON).
+# .address → Extracts the address array from the JSON.
+# | join(", ") →
+# Takes all elements in the array: ["35 Fashion Street", "London", "E1 6PX"]
+# Joins them into a single string, separated by ", ".
+# ❌ Do NOT use .address[] if address is an array of strings
+# ✅ Use .address[] when address is an array of objects
+
+jq -r '.address | join(", ")' person.json

jq/script-03.sh

@@ -5,3 +5,5 @@ set -euo pipefail
 # The input for this script is the person.json file.
 # TODO: Write a command to output the name of the person, then a comma, then their profession.
 # Your output should be exactly the string "Selma, Software Engineer", but should not contain any quote characters.
+
+jq -r '[.name, .profession] | join(", ")' person.json

jq/script-04.sh

@@ -6,3 +6,5 @@ set -euo pipefail
 # TODO: Write a command to output just the names of each player, one per line.
 # Your output should contain 6 lines, each with just one word on it.
 # Your output should not contain any quote characters.
+
+jq -r '.[].name' scores.json

jq/script-05.sh

@@ -5,3 +5,5 @@ set -euo pipefail
 # The input for this script is the scores.json file.
 # TODO: Write a command to output the names of each player, as well as their city.
 # Your output should contain 6 lines, each with two words on it.
+
+jq -r '.[] | "\(.name) \(.city)"' scores.json

jq/script-06.sh

@@ -6,3 +6,5 @@ set -euo pipefail
 # TODO: Write a command to output just the names of each player along with the score from their first attempt.
 # Your output should contain 6 lines, each with one word and one number on it.
 # The first line should be "Ahmed 1" with no quotes.
+
+jq -r '.[] | .scores[0] as $scores | "\(.name) \($scores)" ' scores.json

jq/script-07.sh

@@ -6,3 +6,5 @@ set -euo pipefail
 # TODO: Write a command to output just the names of each player along with the score from their last attempt.
 # Your output should contain 6 lines, each with one word and one number on it.
 # The first line should be "Ahmed 4" with no quotes.
+
+jq -r '.[] | .scores[-1] as $lastScore | "\(.name) \($lastScore)" ' scores.json

jq/script-08.sh

@@ -6,3 +6,5 @@ set -euo pipefail
 # TODO: Write a command to output just the names of each player along with the number of times they've played the game.
 # Your output should contain 6 lines, each with one word and one number on it.
 # The first line should be "Ahmed 3" with no quotes.
+
+jq -r '.[] | "\(.name) \(.scores | length)"' scores.json

jq/script-09.sh

@@ -6,3 +6,13 @@ set -euo pipefail
 # TODO: Write a command to output just the names of each player along with the total scores from all of their games added together.
 # Your output should contain 6 lines, each with one word and one number on it.
 # The first line should be "Ahmed 15" with no quotes.
+
+echo "first solution"
+
+jq -r '.[] | "\(.name) \([.scores[]] | add)"' scores.json
+
+echo ""
+
+echo "simpler solution"
+
+jq -r '.[] | "\(.name) \((.scores | add))"' scores.json

jq/script-10.sh

@@ -5,3 +5,5 @@ set -euo pipefail
 # The input for this script is the scores.json file.
 # TODO: Write a command to output the total of adding together all players' first scores.
 # Your output should be exactly the number 54.
+
+jq '[.[].scores[0]] | add' scores.json

jq/script-11.sh

@@ -5,3 +5,5 @@ set -euo pipefail
 # The input for this script is the scores.json file.
 # TODO: Write a command to output the total of adding together all scores from all games from all players.
 # Your output should be exactly the number 164.
+
+jq '[.[].scores[]] | add' scores.json