자바스크립트 배열 참조
배열 객체
Array 객체는 단일 변수에 여러 값을 저장하는 데 사용됩니다.
const cars = ["Saab", "Volvo", "BMW"];
배열 인덱스는 0부터 시작합니다. 배열의 첫 번째 요소는 0, 두 번째 요소는 1 등입니다.
배열에 대한 자습서는 JavaScript 배열 자습서 를 읽으십시오 .
자바스크립트 배열 메소드
Method | Description |
---|---|
concat() | Joins two or more arrays, and returns a copy of the joined arrays |
copyWithin() | Copies array elements within the array, to and from specified positions |
entries() | Returns a key/value pair Array Iteration Object |
every() | Checks if every element in an array pass a test |
fill() | Fill the elements in an array with a static value |
filter() | Creates a new array with every element in an array that pass a test |
find() | Returns the value of the first element in an array that pass a test |
findIndex() | Returns the index of the first element in an array that pass a test |
forEach() | Calls a function for each array element |
from() | Creates an array from an object |
includes() | Check if an array contains the specified element |
indexOf() | Search the array for an element and returns its position |
isArray() | Checks whether an object is an array |
join() | Joins all elements of an array into a string |
keys() | Returns a Array Iteration Object, containing the keys of the original array |
lastIndexOf() | Search the array for an element, starting at the end, and returns its position |
map() | Creates a new array with the result of calling a function for each array element |
pop() | Removes the last element of an array, and returns that element |
push() | Adds new elements to the end of an array, and returns the new length |
reduce() | Reduce the values of an array to a single value (going left-to-right) |
reduceRight() | Reduce the values of an array to a single value (going right-to-left) |
reverse() | Reverses the order of the elements in an array |
shift() | Removes the first element of an array, and returns that element |
slice() | Selects a part of an array, and returns the new array |
some() | Checks if any of the elements in an array pass a test |
sort() | Sorts the elements of an array |
splice() | Adds/Removes elements from an array |
toString() | Converts an array to a string, and returns the result |
unshift() | Adds new elements to the beginning of an array, and returns the new length |
valueOf() | Returns the primitive value of an array |
자바스크립트 배열 속성
Property | Description |
---|---|
constructor | Returns the function that created the Array object's prototype |
length | Sets or returns the number of elements in an array |
prototype | Allows you to add properties and methods to an Array object |