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Javascript Concatenating Arrays

Two Arrays

var array1 = [1, 2];
var array2 = [3, 4, 5];
var array3 = array1.concat(array2);

var array3 = [...array1, ...array2]


[1, 2, 3, 4, 5]

Multiple Arrays

var array1 = ["a", "b"],
 array2 = ["c", "d"],
 array3 = ["e", "f"],
 array4 = ["g", "h"];

Provide more Array arguments to array.concat()

var arrConc = array1.concat(array2, array3, array4);

var arrConc = [...array1, ...array2, ...array3, ...array4]


["a", "b", "c", "d", "e", "f", "g", "h"]

Without Copying the First Array

var longArray = [1, 2, 3, 4, 5, 6, 7, 8],
 shortArray = [9, 10];

Provide the elements of shortArray as parameters to push using Function.prototype.apply

longArray.push.apply(longArray, shortArray);

Use the spread operator to pass the elements of shortArray as separate arguments to push



[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

Array and non-array values

var array = ["a", "b"];
var arrConc = array.concat("c", "d");
var arrConc = [...array, "c", "d"]


["a", "b", "c", "d"]

You can also mix arrays with non-arrays

var arr1 = ["a","b"];
var arr2 = ["e", "f"];
var arrConc = arr1.concat("c", "d", arr2);


["a", "b", "c", "d", "e", "f"]


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