p5.js createWriter() Function

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The createWriter() function in p5.js is used to create a p5.PrintWriter object that can be used to write or print to various available streams.

Syntax:

createWriter( name, [extension] )

Parameters: This function accepts two parameters as mentioned above and described below.

name: It is a string that denotes the name of the file to be created.
extension: It is a string that specifies the extension of the file. It is an optional parameter.

Return Value: It returns a p5.PrintWriter object that denotes the writer.

The example below illustrates the createWriter() function in p5.js:

Example 1:

let fwriter; 
  
function setup() { 
  createCanvas(600, 300); 
  textSize(18); 
  
  // Create a textarea for the input of text 
  inputArea = createElement("textarea"); 
  inputArea.position(30, 50); 
  inputArea.size(300, 100); 
  
  // Create a button for saving text 
  saveBtn = createButton("Save text"); 
  saveBtn.position(30, 160); 
  saveBtn.mousePressed(saveFile); 
  
  // Setup the writer 
  fwriter = createWriter("note.txt"); 
  
  text("Click on the button below to save the written text", 20, 20); 
} 
  
function saveFile() { 
  // Get the value of the textarea 
  // and split the strings on the basis 
  // of the nextline character 
  stringList = inputArea.value().split("\n"); 
  
  // Save the strings to file 
  for (line of stringList) { 
    fwriter.print(line); 
  } 
  
  // Close the writer 
  fwriter.close(); 
  
  // Clear the writer 
  fwriter.clear(); 
} 

Output:

Example 2:

function setup() { 
  createCanvas(600, 300); 
  textSize(18); 
  
  // Create two inputs for the 
  // multiplication table 
  multiOf = createInput(); 
  multiOf.position(250, 50); 
  multiOf.size(50); 
  
  multiTo = createInput(); 
  multiTo.position(250, 80); 
  multiTo.size(50); 
  
  // Create a button for saving text 
  saveBtn = createButton("Generate and save to file"); 
  saveBtn.position(30, 120); 
  saveBtn.mousePressed(saveFile); 
  
  // Setup the writer 
  fwriter = createWriter("tables.txt"); 
} 
  
function draw() { 
  clear(); 
  text("Fill in the values to generate a multiplication table:", 20, 20); 
  text("Multiplication table of", 20, 60); 
  text("Multiplication table upto", 20, 90); 
} 
  
function saveFile() { 
  // Get the value of the two inputs 
  // and generate table 
  let multipicand = multiOf.value(); 
  let multiMax = multiTo.value(); 
  
  for (let multiplier = 1; multiplier <= multiMax; multiplier++) { 
    let textToWrite = 
      multipicand + " * " + multiplier + " = " + multipicand * multiplier; 
  
    // Print to the writer 
    fwriter.print(textToWrite); 
  } 
  
  // Close the writer 
  fwriter.close(); 
  
  // Clear the writer 
  fwriter.clear(); 
} 

Output:

Online editor: https://editor.p5js.org/

Environment Setup: https://www.zambiatek.com/p5-js-soundfile-object-installation-and-methods/

Reference: https://p5js.org/reference/#/p5/createWriter

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