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JavaScript

Posted by Isabella Tan Hui Huang
Isabella Tan Hui Huang
3,577 Points

Searching multiple names on Student Record (solution without using loop)

I thought there must be a better way to solve this than using loop, and I found some great videos by funFunFunction on YouTube:

Higher order functions Arrow functions

With this, I came up with the solution to searching multiple names quite easily.

const students= [
  {name:"Sara", lang:"Ruby"},
  {name:"Bob", lang:"Python"},
  {name:"Lee", lang:"Javascript"},
  {name:"Sara", lang:"Haskell"},
  {name:"Isa", lang:"Java"},
]

var studentName= prompt("Pick a name:[Sara],[Bob],[Lee] or [Isa]")

//This does the same thing as the function below
var isStudent= (student => student.name=== studentName)

/* This is the anonymous function without use of arrow functions (as above)
var isStudent= function(student){
    return student.name=== studentName
    } */


var studentList= students.filter(isStudent)  
console.log(studentList)

I still don't quite know how or why the variable studentName can be called inside the anonymous function here, but it works JS Fiddle... Maybe someone can explain?

1 Answer

Steven Parker
Steven Parker
231,198 Points
Steven Parker
Steven Parker
231,198 Points

:point_right: The variable studentName is defined at global scope.

Since it's not defined inside of a function, the variable is global and can be accessed from anywhere in the program.

Also, a more conventional syntax for the isStudent declaration would be:

var isStudent = student => student.name === studentName;