JavaScript Concat or Merge Array

Concat or merge array of objects in javaScript; Through this tutorial, i am going to show you how to concate or merge or combine two or more arrays in javascript with examples.

Using the concat() method, you can merge or combine or concat two or more array in javaScript.

JavaScript Concat or Merge Array

  • JavaScript Concat() Method
  • Syntax of the JavaScript Concat or Merge Array
  • Parameters of the javaScript concat() method
  • Example 1 – JavaScript Concat 2 Array
  • Example 2 – Concat 3 Array in JavaScript
  • Example 3 – javaScript Concat Array using For Loop
  • Example 4 – Merge Array Using the Spread operator

JavaScript Concat() Method

Array concat() method is pre build javascript method, which is commonly used to combine or concatenate or merge two or more arrays in javaScript.

Note: This method merges or adds two or more arrays and returns a new single array.

Syntax of the JavaScript Concat or Merge Array

The basic syntax of javascript concat() method is following:

array.concat(array_second, array_third, …, array_n);

Parameters of the javaScript concat() method

ParameterDescription
array_one, array_two,….. array_nThis is required. The arrays to be merged

Example 1 – JavaScript Concat 2 Array

Here, i will take simple example using javaScript concat() method to merge two array in javascript; as shown below:

      var array = ["php", "java"];
      var array2 = ["c", "c#", ".net"];
      var res = array.concat(array2);
      console.log(res);

The output of the above code is: (5) [“php”, “java”, “c”, “c#”, “.net”]

Example 2 – Concat 3 Array in JavaScript

Here, i will take second example for merge or combine 3 javascript numeric arrays; as shown below:

      var array = [1,2,3];
      var array2 = [4,5,6];
      var array3 = [7,8,9,10];
      var res = array.concat(array2, array3);
      console.log(res);

The output of the above code is: (10) [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

Example 3 – javaScript Concat Array using For Loop

Using for loop to merge or combine arrays; as shown below:

const merge = (first, second) => {
  for(let i=0; i<second.length; i++) {
    first.push(second[i]);
  }
  return first;
}

merge([1,2,3], [4,5,6]);

The output of the above code is: (6) [1, 2, 3, 4, 5, 6,]

Example 4 – Merge Array Using the Spread operator

Using spread operator to merge or combine arrays; as shown below:

const arr1 = [1,2,3];
const arr2 = [4,5,6];

// Merge arrays
const merged = [...arr1, ...arr2];

console.log(merged); // [1,2,3,4,5,6]
console.log(arr1); // [1,2,3]
console.log(arr2); // [4,5,6]

The output of the above code is: (6) [1, 2, 3, 4, 5, 6,]

Conclusion

In this tutorial, you have learned how to merge two or more arrays together in javascript using the array concat() method of javascript.

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