javascript - Why doesn't console.log work in the JSC environment but it works in Safari's debug console -

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when use jsc (javascriptcore) engine provided in system library, acts differently when using safari's debug console 

$ /system/library/frameworks/javascriptcore.framework/versions/a/resources/jsc >>> console.log("hello"); exception: typeerror: undefined not object (evaluating 'console.log')

when console.log("hello"); works fine in safari.

tl;dr

var console = function () {     this.log = function(msg){ debug(msg) };  }; var console = new console(); console.log("hello");

safari creates console object available in debug console, not in jsc environment. see safari's console documentation here

adding own console object wraps jsc debug method solved problem:

$ /system/library/frameworks/javascriptcore.framework/versions/a/resources/jsc >>> var console = function () { ...     this.log = function(msg){ debug(msg) }; ... }; undefined >>> var console = new console(); undefined >>> console.log("hello"); -> hello undefined

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