Philipp Horstenkamp
2b58149655
All checks were successful
Auto Maintenance Cycle / pre-commit Autoupdate (push) Successful in 39s
28 lines
1.1 KiB
JavaScript
28 lines
1.1 KiB
JavaScript
// Some functions take a variable number of arguments, or a few expected
|
||
// arguments at the beginning and then a variable number of values to operate
|
||
// on. This helper accumulates all remaining arguments past the function’s
|
||
// argument length (or an explicit `startIndex`), into an array that becomes
|
||
// the last argument. Similar to ES6’s "rest parameter".
|
||
export default function restArguments(func, startIndex) {
|
||
startIndex = startIndex == null ? func.length - 1 : +startIndex;
|
||
return function() {
|
||
var length = Math.max(arguments.length - startIndex, 0),
|
||
rest = Array(length),
|
||
index = 0;
|
||
for (; index < length; index++) {
|
||
rest[index] = arguments[index + startIndex];
|
||
}
|
||
switch (startIndex) {
|
||
case 0: return func.call(this, rest);
|
||
case 1: return func.call(this, arguments[0], rest);
|
||
case 2: return func.call(this, arguments[0], arguments[1], rest);
|
||
}
|
||
var args = Array(startIndex + 1);
|
||
for (index = 0; index < startIndex; index++) {
|
||
args[index] = arguments[index];
|
||
}
|
||
args[startIndex] = rest;
|
||
return func.apply(this, args);
|
||
};
|
||
}
|