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underscoreコードリーディング(isBoolean)

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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)

isBooleanとは

underscorejs.orgのisBoolean

こんな説明。

_.isBoolean(object)

Returns true if object is either true or false.

_.isBoolean(null);
=> false


objectがtrueもしくはfalseだった場合のみtrueを返します。

underscore.isBoolean

コード的にはこのあたり。

  // Is a given value a boolean?
  _.isBoolean = function(obj) {
    return obj === true || obj === false || toString.call(obj) === '[object Boolean]';
  };

obj自体がtrueかfalseに合致する、もしくはtoStringしたものが[object Boolean]に合致した場合にtrueを返す。

ikasumi_wt
なんでもやるエンジニア。 名古屋 -> 東京 JavaScript/PHP周り。 最近:Laravel/Node.js/Electron/Vue.js/React.js。 その他:Heroku,IBM Bluemix
http://ikasumiwt.hatenadiary.jp/
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