[Hacker Rank]: Warmup: Simple Array Sum. Solved ✅.

Author: Gonzalo Diaz

docs/hackerrank/warmup/simple_array_sum.md

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+# [Simple Array Sum](https://www.hackerrank.com/challenges/simple-array-sum/problem)
+
+Difficulty: #easy
+Category: #warmup
+
+Given an array of integers, find the sum of its elements.
+For example, if the array $ ar = [1, 2, 3], 1 + 2 + 3 = 6 $, so return $ 6 $.
+
+## Function Description
+
+Complete the simpleArraySum function in the editor below. It must return the sum
+ of the array elements as an integer.
+simpleArraySum has the following parameter(s):
+
+- ar: an array of integers
+
+## Input Format
+
+The first line contains an integer, , denoting the size of the array.
+The second line contains  space-separated integers representing the array's elements.
+
+## Constraints
+
+$ 0 < n, ar[i] \leq 1000 $
+
+## Output Format
+
+Print the sum of the array's elements as a single integer.
+
+## Sample Input
+
+```text
+6
+1 2 3 4 10 11
+```
+
+## Sample Output
+
+```text
+31
+```
+
+## Explanation
+
+We print the sum of the array's elements: $ 1 + 2 + 3 + 4 + 10 + 11 = 31 $.

src/hackerrank/warmup/mod.rs

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 pub mod solve_me_first;
+pub mod simple_array_sum;

src/hackerrank/warmup/simple_array_sum.rs

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+// @link Problem definition [[docs/hackerrank/warmup/simple_array_sum.md]]
+
+pub fn simple_array_sum(ar: &[i32]) -> i32 {
+  ar.iter().sum()
+}
+

tests/data/hackerrank/warmup/simple_array_sum.testcases.json

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+[
+  {
+    "input": [1, 2, 3, 4, 10, 11],
+    "expected": 31
+  }
+]

tests/hackerrank/warmup/mod.rs

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 pub mod solve_me_first;
+pub mod simple_array_sum;

tests/hackerrank/warmup/simple_array_sum.rs

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+use exercises::hackerrank::warmup::simple_array_sum::simple_array_sum;
+use once_cell::sync::Lazy;
+use serde::Deserialize;
+
+use crate::common;
+use common::utils::load_json;
+
+#[cfg(test)]
+mod tests {
+  use super::*;
+
+  #[derive(Debug, Deserialize)]
+  struct SimpleArraySumTestCase {
+      input: Vec<i32>,
+      expected: i32
+  }
+
+  static TEST_DATA: Lazy<Vec<SimpleArraySumTestCase>> =
+    Lazy::new(|| load_json("tests/data/hackerrank/warmup/simple_array_sum.testcases.json"));
+
+  #[test]
+  fn test_simple_array_sum() {
+    println!("Testing hackerrank::warmup::simple_array_sum::simple_array_sum()");
+
+    for test_case in TEST_DATA.iter() {
+      let slice: &[i32] = &test_case.input;
+      let result = simple_array_sum(slice);
+      assert_eq!(result, test_case.expected);
+    }
+  }
+}