each-arg/dist/each-arg.cjs.js

Iterates through arguments or any other array-like object starting from specific index.

'use strict';

var toArray = require('args-to-arr');
var isArrayLike = require('is-array-like');
var isFunction = require('is-function');

function error(message) {
  return new TypeError(message);
}

function wrapCallback(callback, thisArg, arr, args, argsLen) {
  var extraLen = argsLen - 3;
  return extraLen === 0 ? function (i) {
    return callback.call(thisArg, arr[i], i);
  } : extraLen === 1 ? function (i) {
    return callback.call(thisArg, arr[i], i, args[3]);
  } : function (i) {
    return callback.call.apply(callback, [thisArg, arr[i], i].concat(toArray(args, 3)));
  };
}

function eachArg(arr, start, callback) {
  var args = arguments;
  var argsLen = args.length;

  if (argsLen < 3) {
    throw error("expected 3 arguments, got " + argsLen);
  }

  if (!isArrayLike(arr) && arr !== "") {
    throw error(arr + " can't be converted to array.");
  }

  if (typeof start !== "number" || !isFinite(start)) {
    throw error(start + " is not a valid start point.");
  }

  if (!isFunction(callback)) {
    throw error(callback + " is not a function.");
  }

  var arrObj = Object(arr);
  var len = arrObj.length;

  if (start < 0) {
    start += len;
  }

  var cb = wrapCallback(callback, this, arrObj, args, argsLen);

  for (var i = start; i < len; i++) {
    if (i in arrObj && cb(i)) {
      return;
    }
  }
}

module.exports = eachArg;
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