p5.js | randomSeed() Function

The randomSeed() function in p5.js is used to return a random number each time when run the program. The difference between the random() and randomSeed() function is that random() function produces distinct values each time the program is run but when randomSeed() function is used then it gives a constant random number each time the program is run.

Syntax:

randomSeed( Seed )

Parameters: This function accepts single parameter Seed which is any integer value.



Return Value: It returns a constant random number.

Below programs illustrate the randomSeed() function in p5.js:

Example 1: This example uses randomSeed() function to return a random number each time when run the program.

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function setup() { 
   
    // Creating Canvas size
    createCanvas(550, 140); 
       
    // Set the background color 
    background(220); 
    
    // Calling to randomSeed() function
    randomSeed(9)
      
    // Calling to random() function with
    // min and max parameters
    let A = random(1, 2);
    let B = random(0, 1);
    let C = random(2);
    let D = random(2, 10);
      
    // Set the size of text 
    textSize(16); 
       
    // Set the text color 
    fill(color('red')); 
     
    // Getting random number
    text("Random number between 1 and 2 is: " + A, 50, 30);
    text("Random number between 0 and 1 is: " + B, 50, 60);
    text("Random number between 0 and 2 is: " + C, 50, 90);
    text("Random number between 2 and 10 is: " + D, 50, 110);

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Output:

Note: In the above example, in variable “C” only one parameter is passed then it returns a random number from lower bound 0 to upper bound of that number.

Example 2: This example uses randomSeed() function to return a random number each time when run the program.

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function setup() { 
   
    // Creating Canvas size
    createCanvas(550, 140); 
       
    // Set the background color 
    background(220); 
     
    // Calling to randomSeed() function
    randomSeed(9)
      
    // Calling to random() function with
    // parameter array of some elements
    let A = random([1, 2, 3, 4]);
    let B = random([0, 1]);
    let C = random([2, 6, 7, 9]);
    let D = random([2, 10]);
      
    // Set the size of text 
    textSize(16); 
       
    // Set the text color 
    fill(color('red')); 
     
    // Getting random number
    text("Random number is: " + A, 50, 30);
    text("Random number is: " + B, 50, 60);
    text("Random number is: " + C, 50, 90);
    text("Random number is: " + D, 50, 110);
}    

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Output:

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



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