Looking to simplify this code:
function checkIfExist(container?: string[]): boolean {
if (container) {
return container.indexOf("element") > -1
}
return false
}
...and I had the idea of using Optional Chaining for this purpose. However, it seems to not be working and there might be a misunderstanding on my end...
function checkIfExist(container?: string[]): boolean {
return container?.indexOf("element") > -1 // ERROR: Object is possibly 'undefined'. (2532)
}
To avoid the undefined object error, consider setting a default value for the parameter haystack as an empty array in your function:
function checkExistence(haystack: string[] = []): boolean {
return haystack.indexOf("needle") > -1;
}
An even better approach is to use the includes() method instead of .indexOf():
function checkExistence(haystack: string[] = []): boolean {
return haystack.includes("needle");
}
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