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Lodash _.concat


The lodash _.concat method is a utility function that is used to combine two or more arrays into a single array. It creates a new array that contains all the elements from the original arrays in the order they were passed as arguments to the method. The _.concat method does not modify the original arrays and returns a new array.

The syntax of the _.concat method is as follows:

_.concat(array, [values])

where array is the array to concatenate and [values] are the arrays or values to concatenate with array.

The _.concat method can be used in a variety of scenarios, such as merging multiple arrays, creating a copy of an existing array, or adding items to an existing array. For example:

const array1 = [1, 2, 3];
const array2 = [4, 5, 6];
const array3 = [7, 8, 9];

const concatArray = _.concat(array1, array2, array3);

// Output: [1, 2, 3, 4, 5, 6, 7, 8, 9]

In the example above, array1, array2, and array3 are merged into a single array concatArray using the _.concat method.

The _.concat method also allows for concatenating other data types, such as strings or numbers, along with arrays. For example:

const array1 = [1, 2, 3];
const string = "Hello, World!";
const number = 4;

const concatArray = _.concat(array1, string, number);

// Output: [1, 2, 3, "Hello, World!", 4]

In the example above, string and number are concatenated along with array1 into a single array concatArray.

To summarize, the lodash _.concat method is a powerful utility function that allows for easy and efficient concatenation of multiple arrays or values into a single array. Its flexibility in accepting various data types makes it a valuable method for manipulating arrays and creating new ones.