Find first occurrence of a string in a String array in Typescript/Javascript [duplicate]

Question

I have an empty string array. I push into it new strings, and I do this one by one. Then, it will happen that the string I'm pushing is already in the array, and I want to find the index of that original string and split the array in the range:

[start, index_of_firstString].

So if we have:

myArray: string[] = [];

function(myString: string) {
this.myArray.push(myString);
}

What could be a good solution? I need to check for duplicates every time I push a new string.

You can use indexOf(): ['foo', 'bar', 'baz'].indexOf('bar'); // 1. -1 indicates the value isn't in the array. Any other number is the index in the array. — Gavin
– Gavin, Commented Nov 21, 2019 at 14:02

Kas Elvirov · Accepted Answer · 2021-04-17 13:33:03Z

4

You can use of indexOf function to get the first occurence of your string in your strings array,

var cars = ['ferrari','Audi','ferrari']

console.log(cars.indexOf('ferrari'))

edited Apr 17, 2021 at 13:33

Kas Elvirov

8,1784 gold badges49 silver badges66 bronze badges

answered Nov 21, 2019 at 14:05

Fahad Subzwari

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