Checks if x is a valid array index for arr.
x
arr
The array to check against.
The value to check if it's a valid index.
true if x is a valid index for arr, false otherwise.
true
false
if arr is not an array.
isArrIdx(['a', 'b'], 1) => trueisArrIdx(['a', 'b'], 2) => falseisArrIdx(['a', 'b'], -1) => falseisArrIdx(['a', 'b'], 0.5) => false Copy
isArrIdx(['a', 'b'], 1) => trueisArrIdx(['a', 'b'], 2) => falseisArrIdx(['a', 'b'], -1) => falseisArrIdx(['a', 'b'], 0.5) => false
Checks if
xis a valid array index forarr.