Warmup

Next, complete the following warmup exercises as a team.

How many unique subject codes?

// TODO: replace with code that computes the actual result
var subjectCodes = _.pluck(data, 'Subject')
var result = _.uniq(subjectCodes)
return _.size(result)

They are 113 unique subject codes.

How many computer science (CSCI) courses?

// TODO: replace with code that computes the actual result
var subjectCodes = _.pluck(data, 'Subject')
var result = _.filter(subjectCodes, function(a){
    return a == "CSCI"
})
return _.size(result)

They are 63 computer science courses.

What is the distribution of the courses across subject codes?

// TODO: replace with code that computes the actual result
var list = _.groupBy(data, function(college){
    return college['Subject']
})
return _.mapValues(list, function(courses){
    return courses.length
})

What subset of these subject codes have more than 100 courses?

// TODO: replace with code that computes the actual result
var list = _.groupBy(data, function(college){
    return college['Subject']
})
var values = _.mapValues(list, function(courses){
    return courses.length
})
var result = _.pick(values, function(a){
    return a > 100
})
return result

What subset of these subject codes have more than 5000 total enrollments?

// TODO: replace with code that computes the actual result
var groups = _.groupBy(data, function(college){
    return college['Subject']
})
var courseEnroll = _.mapValues(groups, function(a){
    return _.map(a, function(b){
        return b['N']['ENROLL']
    })
})
var enroll = _.mapValues(courseEnroll, function(enrolls){
    return _.sum(enrolls)
})
return _.pick(enroll, function(number){
    return number > 5000
})

What are the course numbers of the courses Tom (PEI HSIU) Yeh taught?

// TODO: replace with code that computes the actual result
var courses= _.filter(data, function(course){
  var instructor= _.filter(course['Instructors'], function(instructor){
    return instructor['name'] == 'YEH, PEI HSIU'
  })
  return _.size(instructor) > 0
})
return _.map(courses, function(course){
  return course['Course']
})