rochars / wavefile

// https://tc39.github.io/ecma262/#sec-array.prototype.includes

if (!Array.prototype.includes) {

  Object.defineProperty(Array.prototype, 'includes', {

    value: function(searchElement, fromIndex) {

        throw new TypeError('"this" is null or not defined');

      }

      // 1. Let O be ? ToObject(this value).

      var o = Object(this);

      // 2. Let len be ? ToLength(? Get(O, "length")).

      var len = o.length >>> 0;

      // 3. If len is 0, return false.

      if (len === 0) {

        return false;

      }

      // 4. Let n be ? ToInteger(fromIndex).

      //    (If fromIndex is undefined, this step produces the value 0.)

      var n = fromIndex | 0;

      // 5. If n ≥ 0, then

      //  a. Let k be n.

      // 6. Else n < 0,

      //  a. Let k be len + n.

      //  b. If k < 0, let k be 0.

      var k = Math.max(n >= 0 ? n : len - Math.abs(n), 0);

      // 7. Repeat, while k < len

      while (k < len) {

        // a. Let elementK be the result of ? Get(O, ! ToString(k)).

        // b. If SameValueZero(searchElement, elementK) is true, return true.

        if (sameValueZero(o[k], searchElement)) {

          return true;

        }

        // c. Increase k by 1. 

        k++;

      }

      // 8. Return false

      return false;

    }

  });

}

/*! https://mths.be/codepointat v0.2.0 by @mathias */

if (!String.prototype.codePointAt) {

  (function() {

    'use strict'; // needed to support `apply`/`call` with `undefined`/`null`

    var defineProperty = (function() {

      // IE 8 only supports `Object.defineProperty` on DOM elements

      try {

        var object = {};

        var $defineProperty = Object.defineProperty;

        var result = $defineProperty(object, object, object) && $defineProperty;

    }());

    var codePointAt = function(position) {

        throw TypeError();

      }

      var string = String(this);

      var size = string.length;

      // `ToInteger`

      var index = position ? Number(position) : 0;

      if (index != index) { // better `isNaN`

        index = 0;

      }

      // Account for out-of-bounds indices:

      if (index < 0 || index >= size) {

        return undefined;

      }

      // Get the first code unit

      var first = string.charCodeAt(index);

      var second;

      if ( // check if it’s the start of a surrogate pair

        first >= 0xD800 && first <= 0xDBFF && // high surrogate

        size > index + 1 // there is a next code unit

      ) {

        second = string.charCodeAt(index + 1);

        if (second >= 0xDC00 && second <= 0xDFFF) { // low surrogate

          // https://mathiasbynens.be/notes/javascript-encoding#surrogate-formulae

          return (first - 0xD800) * 0x400 + second - 0xDC00 + 0x10000;

        }

      }

      return first;

    };

    if (defineProperty) {

      defineProperty(String.prototype, 'codePointAt', {

        'value': codePointAt,

        'configurable': true,

        'writable': true

      });

    } else {

    }

  }());

}

// tmp fix

if (!Uint8Array.prototype.slice) {

  Object.defineProperty(Uint8Array.prototype, 'slice', {

    value: Array.prototype.slice

  });

}