p5.js |布尔()函数
p5.js 中的boolean()函数用于将给定的字符串和数值转换为其布尔表示形式。
句法:
boolean(Value)
参数:此函数接受单个参数值,将其转换为其布尔表示形式。该值可能是整数、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。
下面的程序说明了 p5.js 中的 boolean()函数:
示例 1:此示例使用 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:此示例使用 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:从上面的示例中,如果参数为非零值,则返回 true,对于字符串,只有“true”字符串返回 true,否则返回任何其他字符串的 false 输出。
参考: https://p5js.org/reference/#/p5/boolean