DEV Community

Cover image for HackerRank — Problem Solving — JavaScript — Diagonal Difference
Abu Saleh Faysal
Abu Saleh Faysal

Posted on

 

HackerRank — Problem Solving — JavaScript — Diagonal Difference

Image description

The Task is to find the absolute difference between the sums of the matrix's two diagonals as a single integer.

Solution

Image description

Explanation
Step 01: Take two variables named "diagonal1" and "diagonal2". Store initial value as zero(0).
Step 02: Iterate a for loop through the given array.
Step 03: While iterating the array we have to take the array matrix's row and column as index i to, then add the value to diagonal1.
Step 04: Reversing the second dimension of array to calculate secondary diagonal.
Step 05: Return absolute difference value.

Latest comments (0)

typescript

11 Tips That Make You a Better Typescript Programmer

1 Think in {Set}

Type is an everyday concept to programmers, but it’s surprisingly difficult to define it succinctly. I find it helpful to use Set as a conceptual model instead.

#2 Understand declared type and narrowed type

One extremely powerful typescript feature is automatic type narrowing based on control flow. This means a variable has two types associated with it at any specific point of code location: a declaration type and a narrowed type.

#3 Use discriminated union instead of optional fields

...

Read the whole post now!