Function isNegativeInteger

Checks if a given number is a negative integer.

Remarks

This function uses the Number.isInteger method to check if the input is an integer, and then checks if it is less than or equal to 0.

Example

isNegativeInteger(-5); ;
//=> true
isNegativeInteger(0);  ;
//=> true
isNegativeInteger(5);  ;
//=> false
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