Call
A function call is an operation or expression that invokes a function or other callable, optionally supplies arguments, and initiates its execution.
Learn AI-Assisted Python Programming, Second Edition
A function call is an invocation that transfers execution to a function and resumes at the code following the invocation when the function returns.
- How it is used
- Uses calls to activate functions, obtain their results, perform work, and test behavior with varied inputs.
- How deep it goes
- Explains arguments, return values, variables, nested execution, and interactive testing, but stops short of implementation internals.
- Examples
- Demonstrates larger, money_made, max, input, print, and a nested sequence of illustrative function calls.
- What you can do after
- Apply it in Python by calling functions, capturing results, testing inputs interactively, and tracing nested execution.
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Modern C
A function call is an expression or statement that invokes a function and supplies any required arguments.
- How it is used
- Uses calls to transfer control to functions and supply the values they need, beginning with formatted terminal output.
- How deep it goes
- Explains call syntax, value passing, prototype-guided conversion, recursive locals, and function-pointer calls; defers pointer-based access when first introducing calls.
- Examples
- Uses a formatted `printf` call, a prototype-driven numeric conversion, and equivalent calls through function-pointer expressions.
- What you can do after
- Apply it to read and write calls whose arguments match a prototype, while distinguishing copied values from access through pointers.
Modern C, Third Edition
A function call is an expression or statement that requests execution of a function with supplied arguments.
- How it is used
- Uses calls to explain how a C program requests work from functions and transfers control to them.
- How deep it goes
- Explains arguments, call by value, function-pointer conversion, recursive locals, and sequencing; defers pointer-based access when first introducing calls.
- Examples
- Uses a formatted printf call, equivalent calls through function pointers, and side-effecting argument calls with two possible outputs.
- What you can do after
- Evaluate/understand it: trace control transfer and argument values, and recognize when side-effecting calls can produce different valid results.
The Art of AI Product Development
Function calling is a model interaction capability in which a language model produces a structured request to invoke a specified software function or tool.
- How it is used
- Connects language models to software tools so applications can retrieve data, perform operations, and act on user requests.
- How deep it goes
- Explains selection, structured execution, reliability options, and risks, but stops short of detailed implementation code.
- Examples
- Uses website analytics retrieval, database queries, calculations, machine-learning access, and function-calling benchmarks as examples.
- What you can do after
- Operate/configure model-tool integrations with structural constraints, validation, security measures, and application-specific evaluation.
Get Programming: Learn to code with Python
A function call is an invocation of a function that executes its body with supplied arguments and produces a result.
- How it is used
- Uses calls to run reusable functions with specific values and use their results in a program.
- How deep it goes
- Traces parameter mapping, call scope, and returned values, including tuples, implicit None, and chained calls.
- Examples
- Demonstrates word_length calls, tuple-returning addition and subtraction, and chained calls to nested functions.
- What you can do after
- Apply calls by supplying values, capturing returned results, and using those results in later statements.
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Secrets of the JavaScript Ninja, Second Edition
The act of executing a function through a function invocation mechanism.
- How it is used
- Uses invocation forms to explain how JavaScript establishes a function’s this context.
- How deep it goes
- Distinguishes four invocation forms and their effects on this, detailing ordinary function calls with a strict-mode comparison.
- Examples
- Demonstrates ninja() and strict samurai() returning window and undefined, alongside method, constructor, call, and apply forms.
- What you can do after
- Understand how invocation form changes this, including ordinary calls in strict and nonstrict mode.
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Build AI-Enhanced Web Apps
Function calling is a technique in which an AI model requests execution of specified functions to obtain information or perform actions and then uses the results in its response.
- How it is used
- Extends AI applications with real-time data retrieval and actions through developer-provided functions or tools.
- How deep it goes
- Explains the request–execute–incorporate workflow and schema role without detailing implementation code.
- Examples
- Uses a weather API lookup and custom Vercel AI SDK tools handled as React components.
- What you can do after
- Apply it via the Vercel AI SDK by defining functions, registering tools, and handling their responses as React components.
Related concepts
- command-line argumentuses · A command-line argument is a value supplied to a program when it is invoked, either as positional input or as an option that configures its behavior.
- printfuses · printf is a formatted-output API that uses a format specification and supplied values to produce text, either returning it or writing it to an output destination.
- thisconfigures · In JavaScript, the this value is determined by a function’s call context or, for an arrow function, inherited lexically.
- function pointer typeuses · A function pointer is a value that designates a callable function and can be stored, passed, or invoked indirectly.
- functionuses · A function is a callable program unit that performs an operation, may accept inputs, and can produce a result or side effect.
- function-like macroequivalent to · A function-like macro is a macro invoked with function-like syntax that accepts token input and expands or transforms it into generated source.
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