JavaScript An Array of Different Names

[makamo66]

I have an array of names and I want to push only the different names to the namesArray. So this code should output only name-3, name-4, and name-5

var names = ["name-1","name-1","name-1","name-1","name-2","name-2","name-3","name-4","name-5","name-6","name-6"];

var namesArray = [];
for(var i = 0; i < names.length; i++){
    
product_name = names[i];
product_name_compare = names[i-1];

    if (product_name != product_name_compare){
        
        namesArray.push(product_name);
    }
}

console.log(namesArray);

This is the output:
[ 'name-1', 'name-2', 'name-3', 'name-4', 'name-5', 'name-6' ]

Desired output is
['name-3', 'name-4', 'name-5']

 

[Ghost]

There are a few things worth considering...

• You must track duplicates even if the name before it is not the same. A duplicate may be separated by another name in a real world scenario when names aren't alphabetically sorted.
• The reason you are getting the duplicate names is because your code is not adding a name when it's a duplicate, but the "first" duplicate is still allowed to stay in the array (ex: the first name-1 goes into array but never gets removed when duplicate name-1s show up)
• You must track the duplicates as you are going through and then filter the excluded names so your final result is a duplicate-free list of names.

var names = ["name-1","name-1","name-1","name-1","name-2","name-2","name-3","name-4","name-5","name-6","name-6"];

var namesArray = [],
    excludeNames = [];

for(var i = 0; i < names.length; i++){
    if(!namesArray.includes(names[i])){ // if not in array:
        namesArray.push(names[i]); // add to array
    } else {  // already in array:
        excludeNames.push(names[i]); // add to our exclude list
    }
}

// now we must remove our exclude list from the names list:
var filtered = namesArray.filter(function(value, index, arr){
    return !excludeNames.includes(value);
});

console.log(filtered);
namesArray = filtered;

 

[makamo66]

Thanks Ghost. That worked.

 

[makamo66]

The code that I needed is part of a larger project. In this project, I loop through a CSV file and output only the product names that have no variants. This is what the project looks like but I am getting the wrong output.

const parse = require('csv-parse');
const fs = require('fs');
const data = [];
    var names = [];
    var colorArray = [];
    var namesArray = [];
    var excludeNames = [];
function getDifferentNames(names) {
    
for(var i = 0; i < names.length; i++){
    
    if(!namesArray.includes(names[i])){ // if not in array:
        namesArray.push(names[i]); // add to array
    } else {  // already in array:
        excludeNames.push(names[i]); // add to our exclude list
    }
}

// now we must remove our exclude list from the names list:
var filtered = namesArray.filter(function(value, index, arr){
    return !excludeNames.includes(value);
});
return filtered;

}   

fs.createReadStream('spreadsheets/output.csv')
  .pipe(parse({ delimiter: ',' }))
  .on('data', (r) => {
    data.push(r); 
  })
  .on('end', () => {
 
    for(var i = 0; i < data.length; i++){

product_name = getDifferentNames(data[i][0]);

colorArray.push([product_name]);

flatArray = [...colorArray];
console.log(flatArray);

    }}
  )

 

[makamo66]

Here is what the input file, unfortunately named output.csv, looks like;

"Freshwater Pearl Disc Beaded Anklet",
"Bead Link Layered Anklet",
"4pcs - Sexy Rhinestone Pave Chain Layered Anklets",
"4pcs - Sexy Rhinestone Pave Chain Layered Anklets",
"4pcs - Baby Rhinestone Pave Chain Layered Anklets",
"4pcs - Baby Rhinestone Pave Chain Layered Anklets",
"Rhinestone Pave Sexy Anklet",
"Rhinestone Pave Sexy Anklet",
"Rhinestone Pave Boss Anklet",
"Rhinestone Pave Glam Anklet",
"Rhinestone Pave Glam Anklet"

 

[makamo66]

So the output should be: "Freshwater Pearl Disc Beaded Anklet", "Bead Link Layered Anklet", "Rhinestone Pave Boss Anklet"

 

[makamo66]

Using square brackets around the data input has improved the output but hasn't fixed it yet. Like this:

product_name = getDifferentNames([data[0]]);

 

[makamo66]

It was outputting gibberish before. Now it's at least outputting the product names, just not the right ones.

 

[makamo66]

The last 3 product names printed to the screen with console.log(flatArray) are the correct ones but I don't know how to output just the last 3 ones.