I've come across code like this multiple times:
function customArrayIndexOf(item, array){
for (var i = 0, l = array.length; i < l; i++) {
if (i in array && array[i] === item) return i;
}
return -1;
}
But I'm unsure about the necessity of i in array.
My queries are:
It is important to note that sparse arrays can lead to false positives if not properly checked for:
var customArrayIndexOf = function(item, arr){
for (var i = 0, len = arr.length; i < len; i++) {
if (i in arr && arr[i] === item) return i;
}
return -1;
},
customArrayIndexOfNoCheck = function(item, arr){
for (var i = 0, len = arr.length; i < len; i++) {
if (arr[i] === item) return i;
}
return -1;
};
var test=[]; test[1]=1;
customArrayIndexOfNoCheck(undefined, test); // 0
customArrayIndexOf(undefined, test); // -1
(i and len should be local variables, declared with var)
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