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Flip the matrix horizontally and invert it using JavaScript
Problem
We are required to write a JavaScript function that takes in a 2-D binary array, arr, (an array that consists of only 0 or 1), as the first and the only argument.
Our function should first flip the matrix horizontally, then invert it, and return the resulting matrix.
To flip the matrix horizontally means that each row of the matrix is reversed. For example, flipping [1, 1, 0] horizontally results in [0, 1, 1].
To invert a matrix means that each 0 is replaced by 1, and each 1 is replaced by 0. For example, inverting [0, 1, 1] results in [1, 0, 0].
For example, if the input to the function is
Input
const arr = [ [1, 1, 0], [1, 0, 1], [0, 0, 0] ];
Output
const output = [ [1,0,0], [0,1,0], [1,1,1] ];
Output Explanation
First we reverse each row −
[[0,1,1],[1,0,1],[0,0,0]]
Then, we invert the matrix −
[[1,0,0],[0,1,0],[1,1,1]]
Example
Following is the code −
const arr = [
[1, 1, 0],
[1, 0, 1],
[0, 0, 0]
];
const flipAndInvert = (arr = []) => {
const invert = n => (n === 1 ? 0 : 1)
for(let i = 0; i < arr.length; i++) {
for(let j = 0; j < arr[i].length / 2; j++) {
const index2 = arr[i].length - 1 - j
if(j === index2) {
arr[i][j] = invert(arr[i][j])
} else {
const temp = arr[i][j]
arr[i][j] = arr[i][index2]
arr[i][index2] = temp
arr[i][j] = invert(arr[i][j])
arr[i][index2] = invert(arr[i][index2])
}
}
}
};
flipAndInvert(arr);
console.log(arr);Output
[ [ 1, 0, 0 ], [ 0, 1, 0 ], [ 1, 1, 1 ] ]
Updated on: 24-Apr-2021
984 Views
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