p5.js NumberDict maxKey()用法及代碼示例

p5.js中p5.NumberDict的maxKey()方法用於查找數字字典中的最高鍵值。鍵值對是一組相互映射的兩個值。可以通過使用該對的關鍵字部分查詢此字典來訪問這些值。數字字典可以存儲可以使用字典方法訪問的多個鍵-值對。

用法:

maxKey()

參數：該函數不接受任何參數。

返回值：它返回一個Number值，它是數字字典中的最高鍵。

以下示例說明了p5.js中的maxKey()方法：

範例1：

Javascript

function setup() { 
  createCanvas(500, 300); 
  textSize(16); 
  
  text("Click on the button to add new " + 
       "values or get the highest key", 
       20, 20); 
  
  text("Key:", 20, 60); 
  text("Value:", 160, 60); 
  
  key_input = createInput('1'); 
  key_input.position(70, 50); 
  key_input.size(40); 
  
  val_input = createInput('1'); 
  val_input.position(220, 50); 
  val_input.size(40); 
  
  setBtn = createButton("Add new item"); 
  setBtn.position(30, 100); 
  setBtn.mouseClicked(addtoDict); 
  
  getBtn = createButton("Get Highest Key"); 
  getBtn.position(160, 100); 
  getBtn.mouseClicked(getHighestKey); 
  
  // Create a Number Dictionary initially 
  numDict = createNumberDict(100, 0); 
} 
  
function addtoDict() { 
  clear(); 
  
  let key = int(key_input.value()); 
  let val = int(val_input.value()); 
  
  numDict.set(key, val); 
  
  text("New key-value added to dictionary", 
       20, 160); 
  
  text("Key:", 20, 60); 
  text("Value:", 160, 60); 
  text("Click on the button to add new " + 
       "values or get the highest key", 
       20, 20); 
} 
  
function getHighestKey() { 
  
  // Get the highest key in the dictionary 
  let highestKey = numDict.maxKey(); 
  
  // Display the highest key 
  text("The highest key in the dictionary is:" + 
       highestKey, 20, 200); 
  
  text("Key:", 20, 60); 
  text("Value:", 160, 60); 
  text("Click on the button to add new " + 
       "values or get the highest key", 
       20, 20); 
}

輸出：

範例2：

Javascript

function setup() { 
  createCanvas(550, 300); 
  textSize(16); 
  
  text("Click on the button to create a " + 
       "new dictionary and get the highest key", 
       20, 20); 
  
  setBtn =  
    createButton("Create random dictionary"); 
  setBtn.position(30, 40); 
  setBtn.mouseClicked(createNewDict); 
  
  getBtn = createButton("Get Highest Key"); 
  getBtn.position(300, 40); 
  getBtn.mouseClicked(getHighestKey); 
} 
  
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); 
    obj[rk] = rn; 
  
    text("Key:" + rk + ":Value:" + 
         rn, 40, 120 + 20 * i); 
  } 
  
  // Create a number dict using 
  // the above values 
  numDict = createNumberDict(obj); 
  
  text("New Dictionary created with values", 
       20, 80); 
  
  text("Click on the button to create a " + 
       "new dictionary and get the highest key", 
       20, 20); 
} 
  
function getHighestKey() { 
  
  // Get the highest key in the dictionary 
  let highestKey = numDict.maxKey(); 
  
  // Display the lowest key 
  text("The highest key in the dictionary is:" + 
       highestKey, 20, 240); 
  
  text("Click on the button to create a " + 
       "new dictionary and get the highest key", 
       20, 20); 
}

輸出：

在線編輯： https://editor.p5js.org/
環境設置： https://www.geeksforgeeks.org/p5-js-soundfile-object-installation-and-methods/
參考： https://p5js.org/reference/#/p5.NumberDict/maxKey

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注：本文由純淨天空篩選整理自sayantanm19大神的英文原創作品 p5.js NumberDict maxKey() Method。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。