Code to reduce execution time by array / caching??? Google App Script - arrays

Question

I'm using the following code to compile a list of hastags which have been seperated from a list of twitter tweets.
This code ignores all rows where the hashtag cell has no value or an error value.
function CopyProcessedHashtags() {
var sSheet = SpreadsheetApp.getActiveSpreadsheet();
var sourceSheet = sSheet.getSheetByName("SortedIntoRows");
var targetSheet = sSheet.getSheetByName("HashtagsList");
var lastRow = sourceSheet.getLastRow();
for (var i = 3; i <= lastRow; i++) {
var cell = sourceSheet.getRange("E" + i);
var val = cell.getValue();
if (val != "") {
if (val != "#VALUE!") {
if (val != "#REF!") {
var sourceRange = sourceSheet.getRange("B" + i + ":" + "E" + i);
var targetRow = targetSheet.getLastRow();
targetSheet.insertRowAfter(targetRow+1);
var targetRange = targetSheet.getRange("B" + (targetRow+1));
sourceRange.copyTo(targetRange, {contentsOnly: true});
}}}}}
};
The trouble is that there is sometimes thousands of rows and execution time is well over 6 mins.
I know batching can reduce execution time...
EXAMPLE
for (var i = 1; i <= 100; i++) {
SpreadsheetApp.getActiveSheet().deleteRow(i);
to
SpreadsheetApp.getActiveSheet().deleteRows(i, 100);
... I just don't know how to rewrite my code to work in this manner.
Still very new to google app script.
If somebody could give me a nudge in the right direction you'r help would be VERY much appreciated.
Thanks!!

Answer 1

You can use getValues() to retrieve all data within the range and filter it using Array.filter().
Example:
Code:
function CopyProcessedHashtags() {
var sSheet = SpreadsheetApp.getActiveSpreadsheet();
var sourceSheet = sSheet.getSheetByName("SortedIntoRows");
var targetSheet = sSheet.getSheetByName("HashtagsList");
var data = sourceSheet.getDataRange().getValues();
var filteredData = data.filter(dataRow => (dataRow[4] != "#VALUE!" && dataRow[4] != "#REF!" && dataRow[4] != ""));
targetSheet.getRange(1,1, filteredData.length, filteredData[0].length).setValues(filteredData);
}
Sample Data:
Output:
References:
getValues()
setValues()
Array.filter()