The addColumn() method of p5.Table in p5.js is used to add a new column to a table object. The method accepts a single parameter that is used to specify a title to the column so that it could be easily referenced later. It is an optional value and not specifying a title would leave the new column’s title as null.
Syntax:
addColumn( [title] )
Parameters: This function accepts a single parameter as mentioned above and described below:
- title: It is a String which denotes the title of the new column. It is an optional parameter.
The examples below illustrates the addColumn() function in p5.js:
Example 1:
javascript
function setup() { createCanvas(500, 300); textSize(16); saveTableBtn = createButton("Save Table"); saveTableBtn.position(30, 50); saveTableBtn.mouseClicked(saveToFile); text("Click on the button to save table to csv", 20, 20); // Create the table table = new p5.Table(); // Add two columns // using addColumn() table.addColumn("author"); table.addColumn("language"); // Add two rows let newRow = table.addRow(); newRow.setString("author", "Dennis Ritchie"); newRow.setString("language", "C"); newRow = table.addRow(); newRow.setString("author", "Bjarne Stroustrup"); newRow.setString("language", "C++"); text("The table has " + table.getColumnCount() + " columns", 20, 100); } function saveToFile() { saveTable(table, "saved_table.csv"); } |
Output:
Example 2:
javascript
function setup() { createCanvas(600, 300); textSize(16); addColBnt = createButton("Add Column"); addColBnt.position(30, 20); addColBnt.mouseClicked(addNewCol); // Create the table table = new p5.Table(); } function addNewCol() { let colName = "Random Column " + floor(random(1, 100)); // Add the given column to table table.addColumn(colName); } function draw() { clear(); // Show the total number of columns // and current column names text("The table has " + table.getColumnCount() + " columns", 20, 60); text("The columns are", 20, 80); for (let i = 0; i < table.columns.length; i++) { text(table.columns[i], 20, 100 + i * 20); } } |
Output:
Online editor: https://editor.p5js.org/
Environment Setup: https://www.geeksforgeeks.org/p5-js-soundfile-object-installation-and-methods/
Reference: https://p5js.org/reference/#/p5.Table/addColumn
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