I'm puzzled by the strange behavior of TypeScript when adding parameters.
const getDir = (lastIndex: number) => {
// my other code
console.log(lastIndex + 10) // result is 1010
}
getDir(10);
The output displays 1010 instead of 20.
Any suggestions on what mistake I might have made?
When working with TypeScript, specifying a type does not automatically handle the conversion for you; you need to take care of that process yourself.
In this specific scenario, it's important to note that the argument being passed to the getDir function is a string rather than a number.
The code snippet provided in the answer successfully achieves the desired outcome (resulting in 20). You can experiment with it further by visiting this link
If the conversion is not managed properly, concatenation instead of addition will occur when using string + string in JavaScript.
There are various methods to convert strings into numbers in JavaScript. One simple approach involves preceding your number with a +, like so: +'10' + 10
For example:
console.log('Should be 20: ', 10 + 10)
console.log('Should be 1010: ', '10' + 10)
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