In TypeScript, which one is right?
[string] vs string[]
public searchOption: [string] = ['date'];
public searchOption: string[] = ['date'];
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Possible duplicate of Difference between type[] and [type] in typescriptLouis– Louis2017-10-25 12:35:37 +00:00Commented Oct 25, 2017 at 12:35
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4 Answers
The second one is right. If you want, you can take a look here https://www.typescriptlang.org/docs/handbook/basic-types.html
1 Comment
JD Byrnes
I know that this post is 4 years old, but this answer is misleading. The first one is also right for ['date'], see typescriptlang.org/docs/handbook/2/objects.html#tuple-types
If all you're going to do is make an array of strings they both seem to behave the same. However the 2nd one is the one you should use.
The first one is so you can make Tuples, like this.
let searchOption: [string, number] = ['date', 1];
Comments
These may appear the same, but they're different. As has been mentioned by others, the first is a tuple, and the second is an array of strings.
If your array has multiple strings (eg. ['one', 'two', 'three']) then the second (string[] is correct)
If, like in your original post, you only have one string in the array, then the first ([string]) is correct.
