Hidayt Rahman

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# flat array from the multi dimensional zig-zag array

To flatten a multi-dimensional zig-zag array in JavaScript, you can use a combination of loops and array manipulation techniques.

Here is an example of how you might flatten a multi-dimensional zig-zag array:

``````const array = [[1, 2, 3], [4, 5, 6], [7, 8, 9]];

// Flatten the array using a loop
const flatArray = [];
for (const subArray of array) {
flatArray.push(...subArray);
}

console.log(flatArray); // Outputs: [1, 2, 3, 4, 5, 6, 7, 8, 9]

``````

In this example, the `flatArray` array is initialized as an empty array. A loop is used to iterate over the elements of the array variable, which represents the multi-dimensional zig-zag array. For each element, the spread operator `(...)` is used to add the elements of the subarray to the `flatArray` array.

This will result in a flattened array that contains all of the elements of the original array in the order they appear.

Alternatively, you can use the `Array.prototype.flat` method to flatten the array, as follows:

``````const array = [[1, 2, 3], [4, 5, 6], [7, 8, 9]];
const flatArray = array.flat();
console.log(flatArray); // Outputs: [1, 2, 3, 4, 5, 6, 7, 8, 9]
``````

The flat method will return a new array that is one level deeper than the input array. To flatten a multi-dimensional array with more than one level of nesting, you can call the flat method multiple times or pass it a depth parameter. For example:

``````const array = [[1, 2, 3], [4, [5, 6], 7], [8, 9]];
const flatArray = array.flat(2);
console.log(flatArray); // Outputs: [1, 2, 3, 4, 5, 6, 7, 8, 9]
``````

This will result in a flattened array that contains all of the elements of the original array in the order they appear.