27 lines
512 B
JavaScript
Executable File
27 lines
512 B
JavaScript
Executable File
function findIndex(array, predicate, self) {
|
|
var len = array.length;
|
|
var i;
|
|
if (len === 0) return -1;
|
|
if (typeof predicate !== 'function') {
|
|
throw new TypeError(predicate + ' must be a function');
|
|
}
|
|
|
|
if (self) {
|
|
for (i = 0; i < len; i++) {
|
|
if (predicate.call(self, array[i], i, array)) {
|
|
return i;
|
|
}
|
|
}
|
|
} else {
|
|
for (i = 0; i < len; i++) {
|
|
if (predicate(array[i], i, array)) {
|
|
return i;
|
|
}
|
|
}
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
module.exports = findIndex
|