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| /** | |
| * Composes a function that returns the result of invoking the given functions | |
| * with the `this` binding of the created function, where each successive | |
| * invocation is supplied the return value of the previous. | |
| * | |
| * @since 3.0.0 | |
| * @category Util | |
| * @param {Function[]} [funcs] The functions to invoke. | |
| * @returns {Function} Returns the new composite function. | |
| * @see flowRight | |
| * @example | |
| * | |
| * import add from 'lodash/add' | |
| * | |
| * function square(n) { | |
| * return n * n | |
| * } | |
| * | |
| * const addSquare = flow(add, square) | |
| * addSquare(1, 2) | |
| * // => 9 | |
| */ | |
| function flow(...funcs) { | |
| const length = funcs.length | |
| let index = length | |
| while (index--) { | |
| if (typeof funcs[index] !== 'function') { | |
| throw new TypeError('Expected a function') | |
| } | |
| } | |
| return function(...args) { | |
| let index = 0 | |
| let result = length ? funcs[index].apply(this, args) : args[0] | |
| while (++index < length) { | |
| result = funcs[index].call(this, result) | |
| } | |
| return result | |
| } | |
| } | |
| export default flow |