Flatten Array

README.md

Install with npm install then execute npm run test

flattenArray.js

const flattenArray = (t) => {
  return t.reduce((current, next) => {
    if(Number.isInteger(next)){
      current.push(next);
    }else if(Array.isArray(next)){
      flattenArray(next).map(i => current.push(i));
    }else{
      throw new Error("Not a Integer or an Array");
    }
    return current;
  }, []);
};

module.exports = {
  flattenArray: flattenArray
}

flattenArray.test.js

let flattenArray = require('./flattenArray.js');

describe("flattenArray", () => {
  test("Successfully flattens into a array of integers", () => {
    const test_object = [
      1,
      [14, 12],
      432,
      [511, [0],
        [212, 5]
      ],
      3
    ];
    const expected_result = [1, 14, 12, 432, 511, 0, 212, 5, 3];
    const result = flattenArray.flattenArray(test_object);
    expect(result).toEqual(expected_result);
  });
});

package.json

{
  "name": "flattenarray",
  "version": "1.0.0",
  "description": "Flattens an array of integers and arrays of integers into an array of integers.",
  "main": "flattenArray.js",
  "author": "Timothy Dalbey",
  "license": "ISC",
  "dependencies": {
    "jest": "^24.9.0"
  },
  "scripts":{
    "test":"jest *.test.js"
  }
}