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@ikasumi_wt

underscoreコードリーディング(isNull)

underscoreに詳しくないので、勉強半分でソースコードを読む。

利用するバージョン

underscore.js(v1.8.3)

isNullとは

underscorejs.orgのisNull

こんな説明。

_.isNull(object)

Returns true if the value of object is null.

_.isNull(null);
=> true
_.isNull(undefined);
=> false

objectがnullだった場合にtrueを返します。

underscore.isNull

コード的にはこのあたり。

  // Is a given value equal to null?
  _.isNull = function(obj) {
    return obj === null;
  };

objとnullとの比較の結果を返す。

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Help us understand the problem. What are the problem?