Question

In: Computer Science

JavaScript each item must have at least three categorical attributes and at least one numeric attribute....

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

Solutions

Expert Solution

<!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> 

**************************************************

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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}

venereology answered 11 months ago
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