p5.js boolean()用法及代码示例

p5.js中的boolean()函数用于将给定的字符串和数字值转换为其布尔表示形式。

用法:

boolean(Value)

参数：此函数接受单个参数Value，该参数将转换为其布尔表示形式。该值可以是整数，浮点数，字符串，布尔值，负值或正值以及值数组。

返回值：它返回转换后的布尔表示形式。

以下示例程序旨在说明p5.js中的boolean()函数：

示例1:本示例使用boolean()函数将输入值转换为其布尔值。

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); 
}

输出：

示例2:本示例使用boolean()函数将输入值转换为其布尔值。

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); 
}

输出：

注意：在上面的示例中，如果参数为非零值，则返回true；对于字符串，仅“true”字符串返回true；否则，对于其他任何字符串，返回false。

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

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注：本文由纯净天空筛选整理自Kanchan_Ray大神的英文原创作品 p5.js | boolean() function。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。