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jido2015/recoginze.js

Created August 24, 2018 10:03
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We have a characterScript function and a way to correctly loop over charac- ters. The next step is to count the characters that belong to each script. The following counting abstraction will be useful there:
Raw
recoginze.js
function countBy(items, groupName) {
let counts = [];
for (let item of items) {
let name = groupName(item);
let known = counts.findIndex(c => c.name == name);
console.log(name);
if (known == -1) {
counts.push({name, count: 1});
} else {
counts[known].count++;
}
}
return counts;
}
console.log(countBy([1, 2, 3, 4, 5], n => n > 2));
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jido2015 commented Aug 24, 2018 •
edited
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// → [{name: false, count: 2}, {name: true, count: 3}]

The book says

'The countBy functions- It returns an array of objects, each of which names a group and tells you the number of elements that were found in that group.

` if (known == -1) {
      counts.push({name, count: 1});

    //No value  from 1 to 5  is (-1).which I understood 

 }
 else {
      counts[known].count++;

   //Here is the problem. 
  // I don't know how the output is formatted this way
  `// → [{name: false, count: 2}, {name: true, count: 3}]`

    }`

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