@material-ui/core/utils/helpers.js

React components that implement Google's Material Design.

"use strict";

var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.capitalize = capitalize;
exports.contains = contains;
exports.findIndex = findIndex;
exports.find = find;
exports.createChainedFunction = createChainedFunction;

var _typeof2 = _interopRequireDefault(require("@babel/runtime/helpers/typeof"));

var _warning = _interopRequireDefault(require("warning"));

function capitalize(string) {
  if (process.env.NODE_ENV !== 'production' && typeof string !== 'string') {
    throw new Error('Material-UI: capitalize(string) expects a string argument.');
  }

  return string.charAt(0).toUpperCase() + string.slice(1);
}

function contains(obj, pred) {
  return Object.keys(pred).every(function (key) {
    return obj.hasOwnProperty(key) && obj[key] === pred[key];
  });
}

function findIndex(arr, pred) {
  var predType = (0, _typeof2.default)(pred);

  for (var i = 0; i < arr.length; i += 1) {
    if (predType === 'function' && !!pred(arr[i], i, arr) === true) {
      return i;
    }

    if (predType === 'object' && contains(arr[i], pred)) {
      return i;
    }

    if (['string', 'number', 'boolean'].indexOf(predType) !== -1) {
      return arr.indexOf(pred);
    }
  }

  return -1;
}

function find(arr, pred) {
  var index = findIndex(arr, pred);
  return index > -1 ? arr[index] : undefined;
}
/**
 * Safe chained function
 *
 * Will only create a new function if needed,
 * otherwise will pass back existing functions or null.
 *
 * @param {function} functions to chain
 * @returns {function|null}
 */


function createChainedFunction() {
  for (var _len = arguments.length, funcs = new Array(_len), _key = 0; _key < _len; _key++) {
    funcs[_key] = arguments[_key];
  }

  return funcs.reduce(function (acc, func) {
    if (func == null) {
      return acc;
    }

    process.env.NODE_ENV !== "production" ? (0, _warning.default)(typeof func === 'function', 'Material-UI: invalid Argument Type, must only provide functions, undefined, or null.') : void 0;
    return function chainedFunction() {
      for (var _len2 = arguments.length, args = new Array(_len2), _key2 = 0; _key2 < _len2; _key2++) {
        args[_key2] = arguments[_key2];
      }

      acc.apply(this, args);
      func.apply(this, args);
    };
  }, function () {});
}