Strings Interpolation Escaping Alternative Delimiters Unicode Transformation Information Equality and Comparison Partial Components Indexing Substrings Extracting Substrin...

Command Line Interface Application Input Options Parameterized options All My CLI: The complete application! Request for user input Output Testing Using Readline and NCurse...

Command Line Interface Application Input Options Parameterized options All My CLI: The complete application Request for user input Output Testing Using Readline and NCurses...

Cross-compilation Cross-compilation Crystal supports a basic form of cross compilation . In order to achieve this, the compiler executable provides two flags: --cross-compile...

Cross-compilation Cross-compilation Crystal supports a basic form of cross compilation . In order to achieve this, the compiler executable provides two flags: --cross-compil...

Constants Pseudo Constants Dynamic assignment Constants Constants can be declared at the top level or inside other types. They must start with a capital letter: PI = 3.14 ...

Constants Pseudo Constants Dynamic assignment Constants Constants can be declared at the top level or inside other types. They must start with a capital letter: PI = 3.14...

Testing Crystal Code Anatomy of a spec file Expectations Equivalence, Identity and Type Truthiness Comparisons Other matchers Expecting errors Focusing on a group of specs ...

Testing Crystal Code Anatomy of a spec file Expectations Equivalence, Identity and Type Truthiness Comparisons Other matchers Expecting errors Focusing on a group of specs ...

Performance Premature optimization Avoiding memory allocations Don’t create intermediate strings when writing to an IO Use string interpolation instead of concatenation Avoid IO...