# Live Code Execution with typeRun

    library(typeR)

## Introduction

`typeRun()` is an enhanced version of `typeR()` that not only simulates typing animation but also executes your R code in real-time. This makes it perfect for:

- 🎓 Live teaching and workshops
- 🎤 Conference presentations
- 📹 Recording tutorials
- 🧪 Interactive demonstrations

## Basic Usage

### Simple Script Execution

The most basic usage is to run an R script with typing animation and live execution:

    # Create a simple script
    cat("# Data Analysis Demo
    x <- 1:10
    mean(x)
    sum(x)
    ", file = "demo.R")

    # Type and execute it
    typeRun("demo.R")

What you’ll see: - Code types out character by character - Each line executes as it’s typed - Results appear immediately after each command

### Comparison: typeR vs typeRun

    # typeR: Just displays, doesn't execute
    typeR("demo.R")
    # Output: Shows the code typing out (no results)

    # typeRun: Types AND executes
    typeRun("demo.R")
    # Output: Shows code typing + execution results

## Customizing the Experience

### Control Typing Speed

    # Slower typing for dramatic effect
    typeRun("demo.R", delay = 0.1, jitter = 0.02)

    # Faster typing for quick demos
    typeRun("demo.R", delay = 0.02, jitter = 0.005)

Parameters: - `delay`: Base time between characters (seconds) - `jitter`: Random variation for natural feel

### Limit Output Length

For long outputs, control how much is displayed:

    cat("
    # Long vector
    long_vec <- 1:1000
    long_vec

    # Large data frame
    big_df <- mtcars[rep(1:32, 10), ]
    big_df
    ", file = "long_output.R")

    # Show only first 5 elements/rows
    typeRun("long_output.R", max_print = 5)

## Working with Models

### Linear Models

    cat("
    # Linear regression
    model <- lm(mpg ~ hp + wt, data = mtcars)
    summary(model)
    ", file = "model_demo.R")

    typeRun("model_demo.R")

What happens: - `model <- lm(...)` executes silently (no output) - `summary(model)` displays the full summary with coefficients, R-squared, etc.

### GLM and Other Models

`typeRun()` handles all model types intelligently:

    cat("
    # Logistic regression
    glm_model <- glm(am ~ hp + wt, data = mtcars, family = binomial)
    summary(glm_model)

    # Poisson regression
    pois_model <- glm(carb ~ mpg, data = mtcars, family = poisson)
    summary(pois_model)
    ", file = "glm_demo.R")

    typeRun("glm_demo.R")

## Interactive Control

### Pause and Resume

During execution, you have full control:

1. Press ESC (or Ctrl+C) to pause
2. You’ll see: `Enter choice (1 resume or 2 stop):`
3. Enter 1 to continue from where you paused
4. Enter 2 to stop completely

    typeRun("long_script.R")
    # Press ESC while running
    # Enter 1 to resume
    # Or enter 2 to stop

This is perfect for: - Answering questions during presentations - Explaining specific code sections - Debugging during demonstrations

## Working with R Markdown and Quarto

### R Markdown Files

`typeRun()` intelligently handles `.Rmd` files:

    # Create an R Markdown example
    typeRun("report.Rmd")

Behavior: - ✅ Types and shows all text - ✅ Executes only R code chunks - ✅ Skips YAML headers - ✅ Preserves narrative flow

### Quarto Documents

Works identically with `.qmd` files:

    typeRun("analysis.qmd")

## Advanced Features

### Custom Evaluation Environment

Run code in an isolated environment to keep your workspace clean:

    # Create custom environment
    my_env <- new.env()

    # Run in that environment
    typeRun("demo.R", envir = my_env)

    # Check what was created
    ls(my_env)
    ls()  # Your global environment is unchanged

### Suppressing Library Messages

Package loading messages are automatically suppressed:

    cat("
    library(ggplot2)  # No startup message shown
    library(dplyr)    # Clean output

    # But code works normally
    mtcars %>% head()
    ", file = "packages.R")

    typeRun("packages.R")
    # Shows only the actual results, not package messages

## Output Handling Details

### What Executes Silently

These don’t produce output (cleaner demos):

    cat("
    # Assignments - silent
    x <- 1:10
    y <- mean(x)

    # Plots - execute but don't clutter console
    plot(x, y)
    hist(x)

    # Package loading - no startup messages
    library(stats)
    ", file = "silent.R")

    typeRun("silent.R")

### What Shows Output

    cat("
    # Direct values
    1:10          # Shows the vector

    # Function calls
    mean(1:10)    # Shows: [1] 5.5

    # Print statements
    print('Hello') # Shows: [1] 'Hello'

    # Model summaries
    summary(lm(mpg ~ hp, data = mtcars))  # Shows full summary
    ", file = "visible.R")

    typeRun("visible.R")

## Practical Examples

### Teaching Linear Regression

    cat("
    # Load data
    data(mtcars)
    head(mtcars, 3)

    # Visualize relationship
    plot(mtcars$hp, mtcars$mpg,
         xlab = 'Horsepower',
         ylab = 'Miles per Gallon',
         main = 'MPG vs Horsepower')

    # Fit model
    model <- lm(mpg ~ hp, data = mtcars)
    summary(model)

    # Add regression line
    abline(model, col = 'red', lwd = 2)

    # Predictions
    new_data <- data.frame(hp = c(100, 150, 200))
    predict(model, new_data)
    ", file = "teaching_demo.R")

    typeRun("teaching_demo.R", delay = 0.08)

### Data Analysis Workflow

    cat("
    # 1. Load and explore
    data <- iris
    str(data)

    # 2. Summary statistics
    summary(data)

    # 3. Visualization
    boxplot(Sepal.Length ~ Species, data = data,
            main = 'Sepal Length by Species',
            col = c('lightblue', 'lightgreen', 'pink'))

    # 4. Statistical test
    aov_result <- aov(Sepal.Length ~ Species, data = data)
    summary(aov_result)

    # 5. Post-hoc test
    TukeyHSD(aov_result)
    ", file = "analysis_demo.R")

    typeRun("analysis_demo.R", delay = 0.06, max_print = 8)

### GLM Demonstration

    cat("
    # Binary outcome: Manual transmission (am)
    # Predictors: HP and weight

    # Fit logistic regression
    logit_model <- glm(am ~ hp + wt,
                       data = mtcars,
                       family = binomial(link = 'logit'))

    # Model summary
    summary(logit_model)

    # Odds ratios
    exp(coef(logit_model))

    # Predicted probabilities
    mtcars$pred_prob <- predict(logit_model, type = 'response')
    head(mtcars[, c('am', 'hp', 'wt', 'pred_prob')])
    ", file = "glm_example.R")

    typeRun("glm_example.R", max_print = 6)

## Tips and Best Practices

### 1. Prepare Your Script

Before presenting:

    # Test your script normally first
    source("demo.R")

    # Then test with typeRun
    typeRun("demo.R")

### 2. Timing Considerations

    # For 5-minute demos: ~0.05 delay
    typeRun("demo.R", delay = 0.05)

    # For dramatic reveals: ~0.1 delay
    typeRun("demo.R", delay = 0.1)

    # For quick reviews: ~0.02 delay
    typeRun("demo.R", delay = 0.02)

### 3. Output Management

    # Lots of output? Limit it
    typeRun("demo.R", max_print = 5)

    # Models in script? They'll show nicely
    # Plots in script? They'll render silently

### 4. Keep Scripts Focused

    # Good: One concept per script
    typeRun("01_data_loading.R")
    typeRun("02_visualization.R")
    typeRun("03_modeling.R")

    # Less good: One giant script
    typeRun("everything.R")  # Too long, hard to control

## Troubleshooting

### Script Not Found

    # Error: The file does not exist
    typeRun("missing.R")

    # Solution: Check file path
    file.exists("demo.R")
    list.files(pattern = "\\.R$")

### Unexpected Output

    # If output looks wrong, test the script normally first
    source("demo.R")

    # Then try with typeRun
    typeRun("demo.R")

### Want to Stop Mid-Execution

    # Press ESC, then enter 2
    # Or press Ctrl+C (on some systems)

## Comparison Table

Feature | `typeR()` | `typeRun()`
--- | --- | ---
Typing animation | ✅ | ✅
Code execution | ❌ | ✅
Shows output | ❌ | ✅
Interactive pause/resume | ❌ | ✅
Output truncation | ❌ | ✅
Custom environment | ❌ | ✅
Model summary handling | N/A | ✅
Library message suppression | N/A | ✅

## See Also

- `?typeR` - Basic typing animation without execution
- `?typeRun` - Full function documentation
- Package website

## Cleanup