<pre class="shiki github-dark shaku"><code>/** * @param {number} num */function sum(a){ const fun = function(b){ if(b){ return sum(a + b) }else { return a } } fun.valueOf = () =&gt; { return a; } return fun;}</code></pre>

Create a Sum - SOLUTION

Create a sum(), which makes following possible const sum1 = sum(1)sum1(2) == 3 // truesum1(3) == 4 // truesum(1)(2)(3) == 6 // truesum(5)(-1)(2) == 6 …