37 lines
963 B
JavaScript
37 lines
963 B
JavaScript
/**
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* Safe chained function
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*
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* Will only create a new function if needed,
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* otherwise will pass back existing functions or null.
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*
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* @param {function} functions to chain
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* @returns {function|null}
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*/
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function createChainedFunction() {
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for (var _len = arguments.length, funcs = new Array(_len), _key = 0; _key < _len; _key++) {
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funcs[_key] = arguments[_key];
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}
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return funcs.filter(function (f) {
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return f != null;
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}).reduce(function (acc, f) {
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if (typeof f !== 'function') {
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throw new Error('Invalid Argument Type, must only provide functions, undefined, or null.');
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}
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if (acc === null) {
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return f;
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}
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return function chainedFunction() {
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for (var _len2 = arguments.length, args = new Array(_len2), _key2 = 0; _key2 < _len2; _key2++) {
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args[_key2] = arguments[_key2];
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}
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acc.apply(this, args);
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f.apply(this, args);
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};
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}, null);
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}
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export default createChainedFunction; |