Array: find() Created at: Dec 30 | Updated at: 2 years ago If a program or a script works with different values united by some formal feature, it is most appropriate to use arrays to store them. These are structures in JavaScript with unique names, and indexes used to address ...
find() 方法返回数组中满足提供的测试函数的第一个元素的值。否则返回undefined。 1 2 3 4 5 functionisBigEnough(element) { returnelement >= 15; } [12, 5, 8, 130, 44].find(isBigEnough);// 130 另请参见findIndex()方法,它返回数组中找到的元素的索引,而不是其值。 如果你需要找到一个元素的...
function isPrime(element, index, array) { var start = 2; while (start <= Math.sqrt(element)) { if (element % start++ < 1) { return false; } } return element > 1; } console.log([4, 6, 8, 12].find(isPrime)); // undefined, not found console.log([4, 5, 8, 12].find(is...
// filtered is [12, 130, 44] find() 方法就会返回那个元素的第一个值,如果没有满足条件的元素,则返回undefined。find方法不会改变数组。 语法 arr.find(callback[, thisArg]) 参数callback 同上 findIndex()方法用来查找数组中某指定元素的索引, 如果找不到指定的元素, 则返回 -1. (2015年的方法) forE...
代码语言:javascript 复制 constarr=[1,2,3,4,5];constresult=$(arr).find((index,value)=>value>3);console.log(result);// [4, 5] inArray inArray方法用于检查一个元素是否存在于数组中。它接受两个参数:需要查找的元素和可选的起始索引。如果找到该元素,则返回其索引;如果未找到,则返回-...
JavaScript Array find() ❮PreviousJavaScript ArrayReferenceNext❯ Example 1 Find the value of the first element with a value over 18: constages = [3,10,18,20]; functioncheckAge(age) { returnage >18; } functionmyFunction() { document.getElementById("demo").innerHTML= ages.find(check...
8,Array的findIndex方法 findIndex()方法返回数组中满足提供的测试函数的第一个元素的索引。否则返回-1。 语法:arr.findIndex(callback[, thisArg]) 注意:1,有返回值(找到的第一个元素下标或者没找到的-1)。2,不改变原数组 代码语言:javascript 复制 ...
In this tutorial, we will learn about the JavaScript Array find() method with the help of examples. In this article, you will learn about the find() method of Array with the help of examples.
The findLast() method does not change the original array.Array Find Methods: MethodFinds indexOf() The index of the first element with a specified value lastIndexOf() The index of the last element with a specified value find() The value of the first element that passes a test findIndex...
In this tutorial, you will learn about the JavaScript Array findIndex() method with the help of examples. The findIndex() method returns the index of the first array element that satisfies the provided test function or else returns -1.