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find the value (if any) that is bound to a given key. The argument to this operation is the key, and the value is returned from the operation. If no value is found, some lookup functions raise an exception, while others return a default value (such as zero, null, or a specific value passed to the constructor).
Immediately invoked function expressions may be written in a number of different ways. [3] A common convention is to enclose the function expression – and optionally its invocation operator – with the grouping operator, [4] in parentheses, to tell the parser explicitly to expect an expression.
The C++ Standard Library's associative containers (std::unordered_map and std::map) use operator[] to get the value associated to a key. If there is nothing associated to this key, it will construct it and value initialize [4] [unreliable source] [failed verification] the value. For simple types like int or float, the value initialization will ...
The following REBOL/Red code demonstrates callback use. As alert requires a string, form produces a string from the result of calculate; The get-word! values (i.e., :calc-product and :calc-sum) trigger the interpreter to return the code of the function rather than evaluate with the function. The datatype! references in a block!
load a float value from local variable 2 fload_3 25 0010 0101 → value load a float value from local variable 3 fmul 6a 0110 1010 value1, value2 → result multiply two floats fneg 76 0111 0110 value → result negate a float frem 72 0111 0010 value1, value2 → result get the remainder from a division between two floats freturn ae 1010 1110
A tabular data card proposed for Babbage's Analytical Engine showing a key–value pair, in this instance a number and its base-ten logarithm. A key–value database, or key–value store, is a data storage paradigm designed for storing, retrieving, and managing associative arrays, and a data structure more commonly known today as a dictionary or hash table.
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Used to finish the execution of a method. It can be followed by a value required by the method definition that is returned to the caller. short The short keyword is used to declare a field that can hold a 16-bit signed two's complement integer. [5] [6] This keyword is also used to declare that a method returns a value of the primitive type ...