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London | Samira Hekmati | Module Tools | Week 2 | jq #42

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5dc1072
format JSON file with Prettier
samirahekmati Mar 9, 2025
e09a003
`jq` command to output the name of the person
samirahekmati Mar 9, 2025
9ab104f
Extract address details correctly using `jq`
samirahekmati Mar 11, 2025
a7caeab
output the name ,a comma,then profession with `jq`
samirahekmati Mar 11, 2025
85c82b3
output just the names of each player with`jq`
samirahekmati Mar 11, 2025
b573926
output the names of players&their city with `jq`
samirahekmati Mar 11, 2025
619b4c9
output the names with their first score with `jq`
samirahekmati Mar 11, 2025
2122968
output the names and their last score with `jq`
samirahekmati Mar 11, 2025
8bec120
output the number of games they played with `jq`
samirahekmati Mar 11, 2025
5d9f6b1
output total scores from all games added together
samirahekmati Mar 11, 2025
b59299c
output the total of all players' first score
samirahekmati Mar 11, 2025
ccbdcc5
output sum of scores from all games,all players
samirahekmati Mar 11, 2025
62f7867
changed variable name from `scores` to `lastScore`
samirahekmati Apr 1, 2025
5018472
added a simpler solution
samirahekmati Apr 1, 2025
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9 changes: 8 additions & 1 deletion jq/scores.json
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@@ -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] }
]
10 changes: 10 additions & 0 deletions jq/script-01.sh
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Expand Up @@ -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

13 changes: 13 additions & 0 deletions jq/script-02.sh
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Expand Up @@ -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
2 changes: 2 additions & 0 deletions jq/script-03.sh
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Expand Up @@ -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
2 changes: 2 additions & 0 deletions jq/script-04.sh
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Expand Up @@ -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
2 changes: 2 additions & 0 deletions jq/script-05.sh
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Expand Up @@ -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
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In script-03 you used join and here you used string interpolation - both work, and both could be used in both places - do you have any thoughts on which you prefer / which is more clear?

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Thank you so much Daniel, @illicitonion for your feedback! I agree that both methods join(", ") and string interpolation are valid, and it's interesting to think about their usage in different contexts.

For example in script-03, I chose join(", ") as I felt it was a cleaner way to handle the array of values (in this case, name and profession). It also keeps the structure clear by dealing with the array directly. On the other hand, in script-05, I used string interpolation because it was more intuitive for handling the dynamic insertion of values within a string.

I don't have a strong preference for one over the other, but I can see how string interpolation may be more flexible, especially if we were working with more complex strings or needing more control over formatting.

I think, if clarity and simplicity are the primary goals, join(", ") works well for array type of structures, while string interpolation might be more readable when we're dealing with individual elements or values.

2 changes: 2 additions & 0 deletions jq/script-06.sh
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Expand Up @@ -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
2 changes: 2 additions & 0 deletions jq/script-07.sh
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Expand Up @@ -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 $scores | "\(.name) \($scores)" ' scores.json
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$scores seems like a bit of a misleading variable name here, can you think why? What could be more clear?

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@samirahekmati samirahekmati Apr 1, 2025 •
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I get what you're trying to say. The variable scores can be misleading because it implies it holds all the scores, but it actually holds just the last score. Renaming it to something like lastScore would make it clearer that it's referring to the most recent score, not the entire list.

2 changes: 2 additions & 0 deletions jq/script-08.sh
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Expand Up @@ -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
2 changes: 2 additions & 0 deletions jq/script-09.sh
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Expand Up @@ -6,3 +6,5 @@ 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.

jq -r '.[] | "\(.name) \([.scores[]] | add)"' scores.json
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What does [.scores[]] here do? Could you write this more simply?

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The part [.scores[]] is iterating over each score for every player, then the add function is summing those scores together.
.scores[] is a shorthand way to work with each element inside the scores array. It pulls out each score and feeds it into the add function, which then sums them up. It works, but it's a bit more complicated than needed.
To simplify it, I can directly sum the scores by using the add function on the .scores array without needing the extra [].

jq -r '.[] | "\(.name) \((.scores | add))"' scores.json

2 changes: 2 additions & 0 deletions jq/script-10.sh
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Expand Up @@ -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
2 changes: 2 additions & 0 deletions jq/script-11.sh
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Expand Up @@ -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