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