The removeColumn() method of p5.Table in p5.js is used to remove the given column from a table. The column to remove can be specified by either using its title or its index value (column ID).
Syntax:
removeColumn( column )
Parameters: This function accepts a single parameter as mentioned above and described below:
- column: It is a String or Number that denotes the name of the column or the column ID to remove.
Below example illustrates the removeColumn() function in p5.js:
Example 1:
function setup() {
createCanvas(500, 400);
textSize(16);
removeColBtn =
createButton( "Clear Last Column" );
removeColBtn.position(30, 60);
removeColBtn.mouseClicked(clearLastColumn);
// Create the table
table = new p5.Table();
// Add columns
table.addColumn( "author" );
table.addColumn( "book" );
table.addColumn( "price" );
table.addColumn( "rating" );
// Add 10 random rows to the table
for (let i = 0; i < 10; i++) {
let newRow = table.addRow();
newRow.setString( "author" ,
"Author " + floor(random(1, 100)));
newRow.setString( "book" ,
"Book " + floor(random(1, 100)));
newRow.setString( "price" ,
"$" + floor(random(10, 100)));
newRow.setString( "rating" ,
random(1, 5).toFixed(2));
}
// Display the rows currently present
getTableRows();
} function clearLastColumn() {
clear();
text( "Click on the button to clear "
+ "the last column in the table" ,
20, 20);
// Get the index of the last column
// of the table
let lastColumn =
table.getColumnCount() - 1;
// Use the removeColumn() method to
// clear the given column of the table
if (lastColumn >= 0)
table.removeColumn(lastColumn);
text( "Last column cleared!" , 20, 140);
getTableRows();
} function getTableRows() {
clear();
text( "Click on the button to clear "
+ "the last column in the table" ,
20, 20);
// Display the total columns
// present in the table
text( "There are " +
table.getColumnCount() +
" columns in the table" , 20, 120);
// Show the table with the columns and rows
for (let r = 0; r < table.getRowCount(); r++)
for (let c = 0; c < table.getColumnCount(); c++)
text(table.getString(r, c), 20
+ c * 100, 140 + r * 20);
} |
Output:
Example 2:
function setup() {
createCanvas(500, 400);
textSize(16);
columnInput = createInput();
columnInput.position(30, 40);
clearColBtn =
createButton( "Clear Given Column" );
clearColBtn.position(30, 70);
clearColBtn.mouseClicked(clearColumn);
// Create the table
table = new p5.Table();
// Add columns
table.addColumn( "author" );
table.addColumn( "book" );
table.addColumn( "price" );
table.addColumn( "rating" );
// Add 10 random rows to the table
for (let i = 0; i < 10; i++) {
let newRow = table.addRow();
newRow.setString( "author" ,
"Author " + floor(random(1, 100)));
newRow.setString( "book" ,
"Book " + floor(random(1, 100)));
newRow.setString( "price" ,
"$" + floor(random(10, 100)));
newRow.setString( "rating" ,
random(1, 5).toFixed(2));
}
// Display the rows currently present
getTableRows();
} function clearColumn() {
clear();
text( "Click on the button to clear "
+ "the given column in the table" ,
20, 20);
// Get the index of the column to be removed
let colToClear =
int(columnInput.value());
// Use the removeColumn() method to
// clear the given column of the table
if (colToClear >= 0 &&
colToClear < table.getColumnCount())
table.removeColumn(colToClear);
text( "Last column cleared!" , 20, 140);
getTableRows();
} function getTableRows() {
clear();
text( "Click on the button to clear "
+ "the given column in the table" ,
20, 20);
// Display the total columns
// present in the table
text( "There are " +
table.getColumnCount() +
" columns in the table" , 20, 120);
for (let r = 0; r < table.getRowCount(); r++)
for (let c = 0; c < table.getColumnCount(); c++)
text(table.getString(r, c),
20 + c * 100,
140 + r * 20);
} |
Output:
Online editor: https://editor.p5js.org/
Environment Setup: https://www.geeksforgeeks.org/p5-js-soundfile-object-installation-and-methods/amp/
Reference: https://p5js.org/reference/#/p5.Table/removeColumn