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`@@ -1925,3 +1925,31 @@ const wave = str => {`
`1925`	`1925`	`---`
`1926`	`1926`
`1927`	`1927`	`[⬆ Back to Top](#javascript-coding-challenges-for-beginners)`
	`1928`	`+`
	`1929`	`+## 56. Concatenation of Array`
	`1930`	`+`
	`1931`	+Write a function that given an integer array `nums` of length `n`, returns an array of length `2n` where `nums` is concatenated to itself.
	`1932`	`+`
	`1933`	+```js
	`1934`	`+const getConcatenation = nums => {`
	`1935`	`+ // Your solution`
	`1936`	`+};`
	`1937`	`+`
	`1938`	`+console.log(getConcatenation([1, 2, 3])); // [1, 2, 3, 1, 2, 3]`
	`1939`	`+console.log(getConcatenation([4, 3, 2, 1])); // [4, 3, 2, 1, 4, 3, 2, 1]`
	`1940`	`+`
	`1941`	+```
	`1942`	`+`
	`1943`	`+<details><summary>Solution</summary>`
	`1944`	`+`
	`1945`	+```js
	`1946`	`+const getConcatenation = nums => {`
	`1947`	`+ return [...nums, ...nums];`
	`1948`	`+};`
	`1949`	+```
	`1950`	`+`
	`1951`	`+</details>`
	`1952`	`+`
	`1953`	`+---`
	`1954`	`+`
	`1955`	`+[⬆ Back to Top](#javascript-coding-challenges-for-beginners)`

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