如何將兩個 JavaScript 數組合併為一個陣列？

Concatenating Arrays in JavaScript

In JavaScript, arrays are used to store ordered collections of data. Combining multiple arrays into a single one can be a common task in programming. This tutorial will demonstrate how to concatenate two arrays to create a new, merged array.

Problem Statement

Given two arrays in JavaScript:

var lines1 = ["a", "b", "c"];
var lines2 = ["d", "e", "f"];

The goal is to combine these two arrays into a single array such that the resulting array contains the elements from both arrays, with the elements from the second array following the first.

Solution

JavaScript provides a convenient method called concat that can be used to concatenate arrays. The concat method takes one or more arrays as arguments and returns a new array containing the concatenation of the provided arrays.

To concatenate the two given arrays, we can use the following code:

var mergedArray = lines1.concat(lines2);

The mergedArray variable now contains a new array that contains the elements from both lines1 and lines2:

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

Accessing Elements from the Concatenated Array

Once the arrays are concatenated, you can access elements from the resulting array using the standard array indexing syntax. For example, the following code will access the fourth element of the mergedArray:

console.log(mergedArray[3]); // Outputs "d"

Conclusion

The concat method provides a simple and efficient way to concatenate arrays in JavaScript. By using concat, you can combine multiple arrays into a single, cohesive array that contains the elements from each of the original arrays.

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