Description

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Beginner · 9 min

Project: a study plan

Combine filtering, totals, and message formatting to summarize a plan.

Select unfinished sessions

Represent sessions as objects so each one can store a title, duration, and completion flag. Filter the collection before summarizing it.

const sessions = [{ title: "Read", minutes: 10, done: true }, { title: "Practice", minutes: 20, done: false }];
const remaining = sessions.filter(session => !session.done);
console.log(remaining.map(session => session.title).join(", "));

Output

Practice

Summarize the plan

A loop can total the selected durations. Format the result only after completing the calculation.

const sessions = [{ minutes: 15 }, { minutes: 20 }];
let minutes = 0;
for (const session of sessions) { minutes += session.minutes; }
console.log(`${sessions.length} sessions: ${minutes} minutes`);

Output

2 sessions: 35 minutes

Put it into practice

  1. Predict each result before running the example.
  2. Complete the coding task, then explain why your solution works.

Try it yourself

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Finish the plan summary

Count only unfinished sessions and total their minutes. Display "2 sessions: 35 minutes".

Practice