nested_array_object_count_specific_value.js

//Milestones having nested array object which was very confusing for me making this gist so that people get confortable with map and reduce function.


const totalMeetings = milestones.map(o => o.exercises.map(i => i.exercise)).reduce((acc, m) => acc.concat(m)).sort()
    const totalCcExercises = totalMeetings?.filter(x => x === 478 || x === 480 || x === 170 || x === 213).length //this will count total repeated number of 478, 480, 170 and 213
    const totalHcExercises = totalMeetings?.filter(x => x === 477 || x === 481 || x === 171 || x === 214).length
    const totalFaExercises = totalMeetings?.filter(x => x === 479 || x === 211).length
    const totalCssExercises = totalMeetings?.filter(x => x === 482 || x === 218).length
    const fafsaCssExercises = totalMeetings?.filter(x => x === 483 || x === 218).length