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Rooted by: Return Number
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  • Code 
    const returnInputNumber = (n = 0) => {
  return +n || 0
};
     Test Cases 
    const assert = require("chai").assert;

describe("Getter", () => {
  it("sample", () => {
    assert.strictEqual(returnInputNumber(-4), -4);
    assert.strictEqual(returnInputNumber(0), 0);   
    assert.strictEqual(returnInputNumber(1), 1);
    assert.strictEqual(returnInputNumber(2), 2);
    assert.strictEqual(returnInputNumber(), 0);
    assert.strictEqual(returnInputNumber("Mistake"), 0);
  });
});
    View Run Output
  • Code
    • const returnInputNumber = (n = 0) => {
    • return typeof n === "number" ? n : 0;
    • return +n || 0
    • };