In my TypeScript 2.x project, I am utilizing lodash as well.
While using the following code:
console.log(_.reduce([1, 2], (result, n) => result + n)); // 3
An error is thrown:
Error TS2365: Operator '+' cannot be applied to types '{}' and 'number'.
To fix the problem, simply change the code to result: number.
console.log(_.reduce([1, 2], (result: number, n) => result + n)); // 3
When TypeScript encounters [1, 2], it can infer that n is a number. However, it cannot determine the type of
result</code until the function returns. Therefore, you must explicitly specify the type.</p>
<p>For instance,</p>
<pre><code>console.log(_.reduce([1, 2], (result, n) => 'hi')); // 'hi'
In this case, the type of result will be inferred as string instead of number.
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