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25 lines
977 B
25 lines
977 B
3 years ago
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import restArguments from './restArguments.js';
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import executeBound from './_executeBound.js';
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import _ from './underscore.js';
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// Partially apply a function by creating a version that has had some of its
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// arguments pre-filled, without changing its dynamic `this` context. `_` acts
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// as a placeholder by default, allowing any combination of arguments to be
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// pre-filled. Set `_.partial.placeholder` for a custom placeholder argument.
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var partial = restArguments(function(func, boundArgs) {
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var placeholder = partial.placeholder;
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var bound = function() {
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var position = 0, length = boundArgs.length;
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var args = Array(length);
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for (var i = 0; i < length; i++) {
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args[i] = boundArgs[i] === placeholder ? arguments[position++] : boundArgs[i];
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}
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while (position < arguments.length) args.push(arguments[position++]);
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return executeBound(func, bound, this, this, args);
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};
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return bound;
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});
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partial.placeholder = _;
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export default partial;
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