How can I access an array/object?

arraysphpobjectpropertiesclass
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Prefer composition over inheritance?

language-agnosticinheritanceoopcompositionaggregation
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Fetch the rows which have the Max value for a column for each distinct value of another column

sqlgreatest-n-per-grouporacle
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Non-static variable cannot be referenced from a static context

javavariablescompiler-errorsnon-static
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What is the JavaScript version of sleep()?

javascriptsleep
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