GAS - Issue with Removing Duplicates from Array

问题

I have a column with a set of numbers I am prepping for a query. Some of these numbers have leading zeros and I will need to keep it on the list with leading zeros and without leading zeros.

What I have done so far is to create a column of values with leading and without leading zeros. Here is an example of the array when I getValues on the column.

[[1],[2],[001],[002],[1],[2]]

The end result should be... [[1],[2],[001],[002]]

The last two were dropped because they were duplicates and I only need it in the array once.

Here is what I am trying but I am having issues:

var array = sh.getRange(1,sh.getLastColumn(),sh.getLastRow(),1).getValues();
var uniqueArray = removeDuplicates(array)

function removeDuplicates(myArray){
  var newArray = [];
  myArray.forEach(function(x){
    if(newArray.indexOf(x[0]) === -1){
      newArray.push(x[0]);
    }                   
  });
}

Error: The array comes back as null and then when I try to get uniqueArray.length it will give me TypeError: Cannot read property 'length' of undefined

I've also tried:

var uniqueArray = Array.from(new Set(array));

This seems like it would be less taxing and I like it but it returns all values. It doesn't drop the duplicates.

What am I doing wrong and what is the best approach? How can I fix this?

回答1:

Using Sets:

const removeDuplicates = arr2d => [...new Set(arr2d.flat())].map(e => [e]);
console.info(removeDuplicates([[1],[2],[001],[002],[1],[2]]))

Use getDisplayValues to get Strings

回答2:

Try this:

function removeDups(mA){
  //Logger.log('vA:',mA);
  let s=new Set();
  mA.forEach(function(a){
    a.forEach(function(e) {
      s.add(e);//add elements to a set
    });
  });
  //Logger.log('set: %s',s.keys());
  const oA=[...s];//expand the set back to a unique array
  //Logger.log('oA: %s',oA);
  return oA;
}

Note: this requires the new v8 engine

Also I noticed that the logger output is reported much more quickly to the same page as you get when you view executions.

JavaScript Set

Set.add()

来源：https://stackoverflow.com/questions/60764597/gas-issue-with-removing-duplicates-from-array

标签

google-apps-script