ionic-framework/ionic/util/util.js

export function noop() {}

export function clamp(min, n, max) {
  return Math.max(min, Math.min(n, max));
}

export function extend(dst) {
  return baseExtend(dst, [].slice.call(arguments, 1), false);
}

export function merge(dst) {
  return baseExtend(dst, [].slice.call(arguments, 1), true);
}

function baseExtend(dst, objs, deep) {
  for (var i = 0, ii = objs.length; i < ii; ++i) {
    var obj = objs[i];
    if (!isObject(obj) && !isFunction(obj)) continue;
    var keys = Object.keys(obj);
    for (var j = 0, jj = keys.length; j < jj; j++) {
      var key = keys[j];
      var src = obj[key];

      if (deep && isObject(src)) {
        if (!isObject(dst[key])) dst[key] = isArray(src) ? [] : {};
        baseExtend(dst[key], [src], true);
      } else {
        dst[key] = src;
      }
    }
  }

  return dst;
}

export function defaults(dest) {
  for (let i = arguments.length - 1; i >= 1; i--) {
    let source = arguments[i] || {};
    for (let key in source) {
      if (source.hasOwnProperty(key) && !dest.hasOwnProperty(key)) {
        dest[key] = source[key];
      }
    }
  }
  return dest;
}

export const isString = val => typeof val === 'string'
export const isFunction = val => typeof val === 'function'
export const isDefined = val => typeof val !== 'undefined'
export const isUndefined = val => typeof val === 'undefined'
export const isObject = val => typeof val === 'object'
export const isArray = Array.isArray

export function pascalCaseToDashCase(str = '') {
  return str.charAt(0).toLowerCase() + str.substring(1).replace(/[A-Z]/g, match => {
    return '-' + match.toLowerCase()
  })
}

let uid = 0
export function nextUid() {
  return ++uid;
}

export class Log {
  static log(...args) {
    console.log.apply(console, args)
  }
  static info(...args) {
    console.info.apply(console, args)
  }
  static warn(...args) {
    console.warn.apply(console, args)
  }
  static error(...args) {
    console.error.apply(console, args)
  }
}

export let array = {
  find(arr, cb) {
    for (let i = 0, ii = arr.length; i < ii; i++) {
      if (cb(arr[i], i)) return arr[i];
    }
  },
  remove(arr, item) {
    const index = arr.indexOf(item)
    if (index === -1) {
      return false
    }
    arr.splice(index, 1)
    return true
  }
}

export function readQueryParams() {
  var queryParams = {}
  const startIndex = window.location.href.indexOf('?')
  if (startIndex !== -1) {
    const queries = window.location.href.slice(startIndex + 1).split('&')
    if (queries.length) {
      queries.forEach((param) => {
        var split = param.split('=')
        queryParams[split[0]] = split[1]
      })
    }
  }
  return queryParams
}