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C#Getting Started

Read the first collection element

C#: Access index zero only after establishing that the collection is nonempty.

C#✓ Tested
JavaGetting Started

Read the first collection element

Java: Access index zero only after establishing that the collection is nonempty.

Java✓ Tested
JavaScriptGetting Started

Read the first collection element

JavaScript: Access index zero only after establishing that the collection is nonempty.

JavaScript✓ Tested
TypeScriptGetting Started

Read the first collection element

TypeScript: Access index zero only after establishing that the collection is nonempty.

TypeScript✓ Tested
C++Getting Started

Read the first collection element

C++: Access index zero only after establishing that the collection is nonempty.

C++✓ Tested
CGetting Started

Read the first collection element

C: Access index zero only after establishing that the collection is nonempty.

C✓ Tested
JavaScriptText handling & Unicode

Trim and discard blank lines

JavaScript: Split a text block, trim each line, and keep nonempty values.

JavaScript✓ Tested
TypeScriptText handling & Unicode

Trim and discard blank lines

TypeScript: Split a text block, trim each line, and keep nonempty values.

TypeScript✓ Tested
HTMLInput constraints

Validate a structured text identifier

HTML: The pattern attribute matches the entire nonempty input; required handles the empty case.

HTML✓ Tested