Results for “file check”
Small, practical examples. Search by task or narrow things down below.
Check whether a variable exists under nounset
Bash Scripts: The plus expansion distinguishes an unset variable without reading its missing value.
Bash Scripts✓ Tested
Check whether all required keys exist
Python: Compare the required key set with a dictionary key view.
Python✓ Tested
Check whether any item matches
JavaScript: some stops once a predicate succeeds.
JavaScript✓ Tested
Check whether any item matches
TypeScript: some stops once a predicate succeeds.
TypeScript✓ Tested
Check whether any selected element matches
jQuery: is returns a Boolean without changing the selection.
jQuery✓ Tested
Check whether every item matches
JavaScript: every stops at the first failed predicate and returns true for an empty array.
JavaScript✓ Tested
Check whether every item matches
TypeScript: every stops at the first failed predicate and returns true for an empty array.
TypeScript✓ Tested
Check whether input is a nonnegative integer
Reject empty input and nonnumeric characters before arithmetic.
validation✓ Tested
Check whether text contains a phrase
Use a case-sensitive Java substring check.
Java✓ Tested
Check whether text ends with a suffix
JavaScript: Use endsWith for a literal case-sensitive ending.
JavaScript✓ Tested
Check whether text ends with a suffix
TypeScript: Use endsWith for a literal case-sensitive ending.
TypeScript✓ Tested
Check whether text starts with a prefix
JavaScript: Use startsWith for a literal case-sensitive prefix comparison.
JavaScript✓ Tested