I'm destructuring the result of a regex match
function getStuffIWant(str: string): string { const [ fullMatch, // [ts] 'fullMatch' is declared but its value is never read. stuffIWant, ] = str.match(/1(.*)2/); return stuffIWant;
}
getStuffIWant("abc1def2ghi");As the comment points out, fullMatch is never used and TSC wants me to know. Is there any way to suppress this error without turning off unused checks across the board?
I've also tried unpacking the array as an object:
const { 1: stuffIWant, // Unexpected SyntaxError: Unexpected token :
} = str.match(/1(.*)2/);2 Answers
Found an answer almost immediately (ain't it always the way) - when destructuring arrays you can ignore select values by adding an extra comma in:
function getStuffIWant(str: string): string { const [ , // full match stuffIWant, ] = str.match(/1(.*)2/); return stuffIWant;
}
getStuffIWant("abc1def2ghi");No variable declared, nothing for TypeScript to get all up in arms about.
Alternative syntax as of TypeScript 4.2:
function getStuffIWant(str: string): string { const [ _fullMatch, stuffIWant, ] = str.match(/1(.*)2/); return stuffIWant;
}
getStuffIWant("abc1def2ghi");Note: str.match can also return null, so the example in the question has an additional compilation error due to ts(2461)
