Warmup

Next, complete the following warmup exercises as a team.

How many unique subject codes?

var codes=_.map(data, function(college){
    return college['Subject']
})
var uniqCodes=_.uniq(codes)
return _.size(uniqCodes)

They are 113 unique subject codes.

How many computer science (CSCI) courses?

var courses=_.filter(data, function(college){
    return college['CrsPBADept'] == 'CSCI'
})
return _.size(courses)

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 groups=_.groupBy(data, function(college){
    return college['Subject']
})
var coursesSize= _.mapValues(groups, function(courses){
    return courses.length
})
return _.pick(coursesSize, function(size){
    return size > 100
})

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

var groups=_.groupBy(data, function(college){
    return college['Subject']
})
var coursesEnroll= _.mapValues(groups, function(courses){
    return _.map(courses, function(course){
        return course['N']['ENROLL']
    })
})
var enroll=_.mapValues(coursesEnroll, function(enrolls){
    return _.sum(enrolls)
})
return _.pick(enroll, function(number){
    return number > 5000
})
/*return {"IPHY": 5507,"MATH": 8725,"PHIL": 5672,"PHYS": 8099,"PSCI": 5491}*/

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']
})
//return ['4830','4830']

They are 4830,4830.