lodash/lodash

Mar 13, 2017
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33 lines (31 sloc) 921 Bytes
      
        /**
      
         * Creates a function that invokes `func`, with the `this` binding and arguments
      
         * of the created function, while it's called less than `n` times. Subsequent
      
         * calls to the created function return the result of the last `func` invocation.
      
         *
      
         * @since 3.0.0
      
         * @category Function
      
         * @param {number} n The number of calls at which `func` is no longer invoked.
      
         * @param {Function} func The function to restrict.
      
         * @returns {Function} Returns the new restricted function.
      
         * @example
      
         *
      
         * jQuery(element).on('click', before(5, addContactToList))
      
         * // => Allows adding up to 4 contacts to the list.
      
         */
      
        function before(n, func) {
      
          let result
      
          if (typeof func != 'function') {
      
            throw new TypeError('Expected a function')
      
          }
      
          return function(...args) {
      
            if (--n > 0) {
      
              result = func.apply(this, args)
      
            }
      
            if (n <= 1) {
      
              func = undefined
      
            }
      
            return result
      
          }
      
        }
      
        export default before
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lodash/lodash

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