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What is the way to find the number of parameters expected by a function

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You can use function.length syntax to find the number of parameters expected by a function. Let's take an example of sum function to calculate the sum of numbers,

javascript
1function sum(num1, num2, num3, num4) {
2  return num1 + num2 + num3 + num4;
3  }
4
5sum.length; // 4 is the number of parameters expected.

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