p5.js boolean()用法及代碼示例

p5.js中的boolean()函數用於將給定的字符串和數字值轉換為其布爾表示形式。

用法:

boolean(Value)

參數：此函數接受單個參數Value，該參數將轉換為其布爾表示形式。該值可以是整數，浮點數，字符串，布爾值，負值或正值以及值數組。

返回值：它返回轉換後的布爾表示形式。

以下示例程序旨在說明p5.js中的boolean()函數：

示例1:本示例使用boolean()函數將輸入值轉換為其布爾值。

function setup() {  
   
    // Creating Canvas size 
    createCanvas(600, 200);  
}  
   
function draw() {  
       
    // Set the background color  
    background(220);  
     
    // Initializing some values 
    let Value1 = 12; 
    let Value2 = 12.5; 
    let Value3 = -7.9; 
    let Value4 = -6;  
    let Value5 = "6"; 
    let Value6 = 0; 
     
    // Calling to boolean() function. 
    let A = boolean(Value1); 
    let B = boolean(Value2); 
    let C = boolean(Value3); 
    let D = boolean(Value4); 
    let E = boolean(Value5); 
    let F = boolean(Value6); 
       
    // Set the size of text  
    textSize(16);  
       
    // Set the text color  
    fill(color('red'));  
     
    // Getting boolean representation 
    text("Boolean representation of value 12 is: " + A, 50, 30); 
    text("Boolean representation of value 12.5 is: " + B, 50, 60); 
    text("Boolean representation of value -7.9 is: " + C, 50, 90); 
    text("Boolean representation of value -6 is: " + D, 50, 110); 
    text("Boolean representation of string '6' is: " + E, 50, 140); 
    text("Boolean representation of string 0 is: " + F, 50, 170); 
}

輸出：

示例2:本示例使用boolean()函數將輸入值轉換為其布爾值。

function setup() {  
   
    // Creating Canvas size 
    createCanvas(600, 140);  
}  
   
function draw() {  
       
    // Set the background color  
    background(220);  
     
    // Initializing some values 
    let Value1 = true; 
    let Value2 = false; 
    let Value3 = "Geeks"; 
    let Value4 = [12, 3.6, -9.8, "true", false, "Geeks"]; 
     
    // Calling to boolean() function. 
    let A = boolean(Value1); 
    let B = boolean(Value2); 
    let C = boolean(Value3); 
    let D = boolean(Value4); 
       
    // Set the size of text  
    textSize(16);  
       
    // Set the text color  
    fill(color('red'));  
     
    // Getting boolean representation 
    text("Boolean representation of value 'true' is: " + A, 50, 30); 
    text("Boolean representation of value 'false' is: " + B, 50, 60); 
    text("Boolean representation of value 'Geeks' is: " + C, 50, 90); 
    text("Boolean representation of array of values are: " + D, 50, 110); 
}

輸出：

注意：在上麵的示例中，如果參數為非零值，則返回true；對於字符串，僅“true”字符串返回true；否則，對於其他任何字符串，返回false。

參考： https://p5js.org/reference/#/p5/boolean

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注：本文由純淨天空篩選整理自Kanchan_Ray大神的英文原創作品 p5.js | boolean() function。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。