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0e9d44eedb
* Enable flow and flowRight tests * Remove flow and flowRight tests for default value and shortcut fusion * Use native rest parameters / spread operator in flow and flowRight * Fix syntax of flow and flowRight examples
42 lines
1017 B
JavaScript
42 lines
1017 B
JavaScript
/**
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* Composes a function that returns the result of invoking the given functions
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* with the `this` binding of the created function, where each successive
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* invocation is supplied the return value of the previous.
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*
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* @since 3.0.0
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* @category Util
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* @param {Function[]} [funcs] The functions to invoke.
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* @returns {Function} Returns the new composite function.
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* @see flowRight
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* @example
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*
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* import add from 'lodash/add'
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*
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* function square(n) {
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* return n * n
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* }
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*
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* const addSquare = flow(add, square)
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* addSquare(1, 2)
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* // => 9
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*/
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function flow(...funcs) {
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const length = funcs ? funcs.length : 0
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let index = length
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while (index--) {
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if (typeof funcs[index] != 'function') {
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throw new TypeError('Expected a function')
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}
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}
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return function(...args) {
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let index = 0
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let result = length ? funcs[index].apply(this, args) : args[0]
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while (++index < length) {
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result = funcs[index].call(this, result)
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}
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return result
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}
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}
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export default flow
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