比较数组中的值（应用程序脚本）

Question

first I'm new to Apps Script respectively Javascript. However in Google Sheets with Apps Script I have filled an array with the contents of one column. Now I would like to find matching values in this array. I tried the following code with a simple array like [2,5,3,6,2,7] and the code works. It doesn't work though with the values from the column (eg something like '110rt' or '38tzu0'):

let z = sheet.getRange("D2:D" + sheet.getLastRow())
let a = z.getValues()

for (let i = 0; i < a.length; i++) {
    for (let k = i + 1; k < a.length; k++) {
        if (a[i] == a[k]) {
            console.log("hit")
    }
}

}

So in the above code the if clause never becomes true and I don't understand why.

Answer 1

When you use getRange with multiple rows, it returns each row in a seperate sub-array. The end result is a 2D array, where each sub-array represent a row.

For example:

[
  [A1,B1,C1,...],
  [A2,B2,C2,...],
  [A3,B3,C3,...]
]

In your case, where you have only one column, it looks like that:

[[2 ],[5 ],[3 ],[6 ],[2 ],[7]]
[[D2],[D3],[D4],[D5],[D6],[D7]] // the matching cells

The buttom line is that you need to iterate a[k][0] and a[i][0]

let z = sheet.getRange("D2:D" + sheet.getLastRow())
let a = z.getValues()

for (let i = 0; i < a.length; i++) {
    for (let k = i + 1; k < a.length; k++) {
        if (a[i][0] == a[k][0]) {
            console.log("hit")
    }
}