If target is negative, it is treated as length+target where length is the length of the array.
If start is negative, it is treated as length+start. If end is negative, it is treated as length+end.
If not specified, length of the this object is used as its default value.
Returns the this object after filling the section identified by start and end with value
value to fill array section with
index to start filling the array at. If start is negative, it is treated as length+start where length is the length of the array.
index to stop filling the array at. If end is negative, it is treated as length+end.
Returns the value of the first element in the array where predicate is true, and undefined otherwise.
find calls predicate once for each element of the array, in ascending order, until it finds one where predicate returns true. If such an element is found, find immediately returns that element value. Otherwise, find returns undefined.
If provided, it will be used as the this value for each invocation of predicate. If it is not provided, undefined is used instead.
Returns the index of the first element in the array where predicate is true, and -1 otherwise.
find calls predicate once for each element of the array, in ascending order, until it finds one where predicate returns true. If such an element is found, findIndex immediately returns that element index. Otherwise, findIndex returns -1.
If provided, it will be used as the this value for each invocation of predicate. If it is not provided, undefined is used instead.
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Returns the this object after copying a section of the array identified by start and end to the same array starting at position target