1
const add = (a, b, c) => a + b + c;
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const a1 = currying(add, 1);
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const a2 = a1(2);
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console.log(a2(3)) // 6

1
// curry pro
2
function curryPro(fn, ...outerProps) {
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  function curried(...middleProps) {
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    const concatArr = [...middleProps];
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    if (concatArr.length >= fn.length) {
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      return fn.call(this, ...concatArr)
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    }
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    return function (...innerProps) {
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      return curried.call(this, ...concatArr.concat(innerProps))
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    }
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  }
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  if(outerProps.length){
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    return curried(...outerProps);
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  }
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  return curried
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}