how to find if string not exist in array nodejs

Question

I have a string array and i want to check if str2 not exist in str1 flag = true

symbols=["A","B","C"];
symbol="D"
if (symbols.indexOf(symbol) === false)
                flag = true;

Mahmoud ELLOUZE · Accepted Answer · 2020-03-09 18:33:42Z

1

when IndexOf doesn't find a symbole it returns -1. So your code should be

if (symbols.indexOf(symbol) === -1)

answered Mar 9, 2020 at 18:33

Mahmoud ELLOUZE

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Comments

pzaenger · Accepted Answer · 2020-03-09 18:39:36Z

1

if (!symbols.includes(symbol)) {
  // symbol is not in symbols
}

You can also use find or indexOf if appropriate.

answered Mar 9, 2020 at 18:31

pzaenger

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