In: Computer Science
JavaScript
each item must have at least three categorical attributes and at least one numeric attribute.
Write a function that counts the number of values each item attribute has. This is effectively a group-by on the item table for each column. For example: if the first attribute is colour, and its values are [ ‘red’, ‘black’, ‘white’, ‘black’, ‘red’ ],
the counts for colour would be: red 2 black 2 white 1
<!DOCTYPE html> <html> <body> <h2>JavaScript GroupBy</h2> <script> var items = {color: ['red', 'red', 'white', 'black', 'white'], style: ['long', 'long', 'short', 'short', 'medium', 'long'], size: [6, 8, 10, 12, 6, 12, 10]} function groupBy(items) { var result = {} for (var prop in items) { var r = {} var arr = items[prop] for(var i=0; i<arr.length; i++) { if(arr[i] in r) { r[arr[i]] += 1; } else { r[arr[i]] = 1; } } result[prop] = r } return result } console.log(groupBy(items)) </script> </body> </html>
************************************************** Thanks for your question. We try our best to help you with detailed answers, But in any case, if you need any modification or have a query/issue with respect to above answer, Please ask that in the comment section. We will surely try to address your query ASAP and resolve the issue.
Please consider providing a thumbs up to this question if it helps you. by Doing that, You will help other students, who are facing similar issue.
function groupBy(arr) { var result = { for(var i=0; i<arr.length; i++) { if(colors[i] in result) { result[colors[i]] += 1; } else { result[colors[i]] = 1; return result console.log(groupBy (colors) </scrint> o Elements Console Sources Network Performanc Do top - url:https://distantsupportives {red: 2, black: 2, white: 1}