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p5.js TypedDict get() Method

  • Last Updated : 25 Nov, 2020

The get() method of p5.TypedDict in p5.js is used to return the value at the given key of the dictionary. The method returns undefined if the key does not exist in the dictionary. A key-value pair is a set of two values that are mapped to each other. These values can be accessed by querying this dictionary using the key portion of the pair. A typed dictionary can store multiple key-value pairs that can be accessed using the methods of the dictionary.

Syntax: 

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get( key )

Parameters: This method accepts a single parameter as shown above and discussed below:

  • key: This is a number or string that denotes the key that has to be added to the dictionary.

Return Value: This method returns a number or string that denotes the value stored at the given key.



The example below illustrates the get() method in p5.js:

Example:

Javascript




let y = 0;
  
function setup() {
  createCanvas(550, 500);
  textSize(16);
  
  text("Click the buttons to create a " +
       "dictionary or get the value of the key",
       20, 20);
  
  text("Key:", 20, 260);
  
  key_input = createInput('user');
  key_input.position(70, 250);
  key_input.size(80);
  
  setBtn = 
    createButton("Create dictionary");
  setBtn.position(30, 40);
  setBtn.mouseClicked(createNewDict);
  
  getBtn = 
    createButton("Get the value of the given key");
  getBtn.position(30, 290);
  getBtn.mouseClicked(getVal);
}
  
function createNewDict() {
  clear();
  
  // Create an object with random values
  let obj = {};
  for (let i = 0; i < 5; i++) {
    let rk = ceil(Math.random() * 100);
    let rn = floor(Math.random() * 100);
  
    let rkey = "user" + rk;
    let rval = "data" + rn;
    obj[rkey] = rval;
  
    text("Key: " + rkey + "  Value: " +
         rval, 40, 120 + 20 * i);
  }
  
  // Create a string dict using the above values
  numDict = createStringDict(obj);
  
  text("New Dictionary created with values",
       20, 80);
  
  text("Click the buttons to create a " +
       "dictionary or get the value of the key",
       20, 20);
  
  text("Key:", 20, 260);
}
  
function getVal() {
  
  // Get the key to be retrieved
  let keyToCheck = key_input.value();
  
  // Get the value of the key from the dictionary
  let keyVal = numDict.get(keyToCheck);
  
  text("The value at key: " + keyToCheck +
       " is: " + keyVal, 20, 340 + y * 20);
  
  y++;
  
  text("Click the buttons to create a " +
       "dictionary or get the value of the key",
       20, 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.TypedDict/get




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