24 lines
682 B
JavaScript
24 lines
682 B
JavaScript
var isUndef = require('./isUndef');
|
|
exports = function(fn, ctx, argCount) {
|
|
if (isUndef(ctx)) return fn;
|
|
switch (argCount == null ? 3 : argCount) {
|
|
case 1:
|
|
return function(val) {
|
|
return fn.call(ctx, val);
|
|
};
|
|
case 3:
|
|
return function(val, idx, collection) {
|
|
return fn.call(ctx, val, idx, collection);
|
|
};
|
|
case 4:
|
|
return function(accumulator, val, idx, collection) {
|
|
return fn.call(ctx, accumulator, val, idx, collection);
|
|
};
|
|
}
|
|
return function() {
|
|
return fn.apply(ctx, arguments);
|
|
};
|
|
};
|
|
|
|
module.exports = exports;
|