62 lines
2.3 KiB
JavaScript
62 lines
2.3 KiB
JavaScript
import _curry2 from "./internal/_curry2.js";
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import _isFunction from "./internal/_isFunction.js";
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import curryN from "./curryN.js";
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import toString from "./toString.js";
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/**
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* Given an `arity` (Number) and a `name` (String) the `invoker` function
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* returns a curried function that takes `arity` arguments and a `context`
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* object. It will "invoke" the `name`'d function (a method) on the `context`
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* object.
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*
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* @func
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* @memberOf R
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* @since v0.1.0
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* @category Function
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* @sig Number -> String -> (a -> b -> ... -> n -> Object -> *)
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* @param {Number} arity Number of arguments the returned function should take
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* before the target object.
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* @param {String} method Name of any of the target object's methods to call.
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* @return {Function} A new curried function.
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* @see R.construct
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* @example
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* // A function with no arguments
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* const asJson = invoker(0, "json")
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* // Just like calling .then((response) => response.json())
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* fetch("http://example.com/index.json").then(asJson)
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*
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* // A function with one argument
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* const sliceFrom = invoker(1, 'slice');
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* sliceFrom(6, 'abcdefghijklm'); //=> 'ghijklm'
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*
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* // A function with two arguments
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* const sliceFrom6 = invoker(2, 'slice')(6);
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* sliceFrom6(8, 'abcdefghijklm'); //=> 'gh'
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*
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* // NOTE: You can't simply pass some of the arguments to the initial invoker function.
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* const firstCreditCardSection = invoker(2, "slice", 0, 4)
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* firstCreditCardSection("4242 4242 4242 4242") // => Function<...>
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*
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* // Since invoker returns a curried function, you may partially apply it to create the function you need.
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* const firstCreditCardSection = invoker(2, "slice")(0, 4)
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* firstCreditCardSection("4242 4242 4242 4242") // => "4242"
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*
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* @symb R.invoker(0, 'method')(o) = o['method']()
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* @symb R.invoker(1, 'method')(a, o) = o['method'](a)
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* @symb R.invoker(2, 'method')(a, b, o) = o['method'](a, b)
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*/
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var invoker =
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/*#__PURE__*/
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_curry2(function invoker(arity, method) {
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return curryN(arity + 1, function () {
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var target = arguments[arity];
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if (target != null && _isFunction(target[method])) {
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return target[method].apply(target, Array.prototype.slice.call(arguments, 0, arity));
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}
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throw new TypeError(toString(target) + ' does not have a method named "' + method + '"');
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});
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});
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export default invoker; |