What is the implementation below the isInteger() function in Javascript?

userGShR 0
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I used a Number Object Method in JS which is isInteger(num). This function returns "true" if num is an Integer and vice versa. I want to understand how this function works but can't figure it out. So, I want to ask:

  1. What is the implementation of isInteger() function in JS? (the logic)

  2. Is there any reference website to see the implementation of other build-in methods in JS?

numbers javascript
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