Sometimes it is convenient to have a single expression which evaluates several subexpressions in order, returning the value of the last subexpression as its value. Everyday programming requires no direct usage of tasks, but certain problems can be solved much more easily by using tasks. This is a powerful construct: both exception handling and cooperative multitasking are implemented in Julia using tasks. Tasks are not so standard: they provide non-local control flow, making it possible to switch between temporarily-suspended computations. The first five control flow mechanisms are standard to high-level programming languages. Exception Handling: try- catch, error and throw.Repeated Evaluation: Loops: while and for.Short-Circuit Evaluation: logical operators & (“and”) and || (“or”), and also chained comparisons.Conditional Evaluation: if- elseif- else and ?: (ternary operator).Julia provides a variety of control flow constructs: Instrumenting Julia with DTrace, and bpftrace.
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