p5.js TypedDict clear() 方法
p5.js 中 p5.TypedDict 的clear() 方法用于删除类型化字典中的所有键值对。键值对是一组相互映射的两个值。可以通过使用该对的键部分查询此字典来访问这些值。类型化字典可以存储多个键值对,可以使用字典的方法访问这些键值对。
句法:
clear()
参数:此方法不接受任何参数。
下面的示例说明了 p5.js 中的clear() 方法:
例子:
Javascript
function setup() {
createCanvas(550, 500);
textSize(16);
let tmpObj = {
"Statue of Unity": "182 m",
"Spring Temple Buddha": "128 m",
"Ushiku Daibutsu": "100 m",
"Great Buddha of Thailand": "92m"
};
// Create a new dictionary
let stringDict =
createStringDict(tmpObj);
text("New string dictionary created " +
"with four keys", 20, 40);
// Check for a key
let existOne =
stringDict.hasKey('Spring Temple Buddha');
text("Dictionary has key " +
"'Spring Temple Buddha': " +
existOne, 20, 80);
// Check the current size
let currSize = stringDict.size();
text("Current size of the dictionary: " +
currSize, 20, 100);
// Clear the dictionary
stringDict.clear();
text("Dictionary has been cleared!",
20, 140);
// Check for a key again
existOne =
stringDict.hasKey('Spring Temple Buddha');
text("Dictionary has key " +
"'Spring Temple Buddha': " +
existOne, 20, 180);
// Check the current size again
currSize = stringDict.size();
text("Current size of the dictionary: " +
currSize, 20, 200);
}
输出:
在线编辑器: https://editor.p5js.org/
环境设置: https://www.geeksforgeeks.org/p5-js-soundfile-object-installation-and-methods/
参考: https://p5js.org/reference/#/p5.TypedDict/clear