Home>Article>Web Front-end> Commonly used array methods in JavaScript
some() method
This method checks whether at least one element of the array meets the conditions checked by the parameter function.
Output:
true
reduce() method
The array reduce() method in JavaScript is used to reduce an array into a single value and for each value of the array (from left to right) and the return value executes a provided function. The function is stored in the accumulator.
Output:
3
map() method
The map() method in JavaScript creates an array by calling a specific function on each element present in the parent array . This is a non-mutating method. Typically, the map() method is used to iterate over an array and call a function on each element of the array.
Output:
true
flat() method
This method creates a new array containing multiple arrays. Basically create a simple array from an array containing multiple arrays.
Output:
11,89,23,7,98
flatMap() method
This method is used to flatten the input array elements into a new array. This method first maps each element with the help of map function and then flattens the input array elements into a new array.
Output:
112、52、944
findindex() method
This method returns the index of the first element in the given array that satisfies the provided test function. Otherwise, -1 is returned.
Output:
2
find()方法
此方法用于获取满足所提供条件的数组中第一个元素的值。它检查数组的所有元素,以及第一个满足条件的要打印的元素。
输出:
30
fill()方法
此方法用于使用给定的静态值填充数组。该值可以用于填充整个数组,也可以用于填充数组的一部分。
输出:
1,87,87,58
forEach()方法
该方法为数组的每个元素调用一次提供的函数。提供的函数可以对给定数组的元素执行任何类型的操作。
输出:
10、25、50、88
concat()方法
此方法用于将两个或多个数组合并在一起。此函数不会更改作为参数传递的原始数组。
输出:
11,12,13,14,15,15,16,17,18,19
include()方法
此方法用于知道数组中是否存在特定元素,因此,它返回true或false,即,如果该元素存在,则返回true,否则返回false。
输出:
true
reverse()方法
此方法用于数组的就地反转。数组的第一个元素变为最后一个元素,反之亦然。