find 命令示例_数组find（）方法以及JavaScript中的示例

find 命令示例

JavaScript find()方法 (JavaScript find() method)

find() method is used to get the first element from an array which passes the given test (condition).

find()方法用于从通过给定测试(条件)的数组中获取第一个元素。

Syntax:

句法：

    array.find(function, [value]);

Parameters: A function name and an optional value to be tested with all elements.

参数：要与所有元素一起测试的功能名称和可选值。

Ref: JS Array find() function

参考： JS Array find()函数

Return value: A first element which passes the test.

返回值：通过测试的第一个元素。

Example:

例：

    //function for positive value
    function getPositive(n){
        return n>=0;
    }

    Input:
    var numbers = [-30, -10, 20, 20, 30, 0, 40];

    Function call:
    var item = numbers.find(getPositive);

    Output:
    20

JavaScript code to find first positive number from an array using Array.find() method

JavaScript代码使用Array.find()方法从数组中查找第一个正数

<html>
<head>
<title>JavaScipt Example</title>
</head>

<body>
	<script>
		//function for positive value
		function getPositive(n){
			return n>=0;
		}
		
		var numbers = [-30, -10, 20, 20, 30, 0, 40];
		//find first positive number
		var item = numbers.find(getPositive);
		document.write("first positive number is " + item + "<br>");
	</script>
</body>
</html>

Output

输出量

first positive number is 20

翻译自: https://www.includehelp.com/code-snippets/array-find-method-with-example-in-javascript.aspx

find 命令示例