{"id":18887,"date":"2022-11-02T06:48:04","date_gmt":"2022-11-02T01:18:04","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-how-exactly-does-javascipts-data-type-convertion-work-for-operator\/"},"modified":"2022-11-02T06:48:04","modified_gmt":"2022-11-02T01:18:04","slug":"solved-how-exactly-does-javascipts-data-type-convertion-work-for-operator","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-how-exactly-does-javascipts-data-type-convertion-work-for-operator\/","title":{"rendered":"[Solved] How exactly does JavaScipt’s data-type convertion work for “==” operator?"},"content":{"rendered":"

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As Crockford says: “The rules by which they do that are complicated and unmemorable.” The spec defines them all in section 11.9.3<\/a> (pointed out by @Oriol in a comment to OP).<\/p>\n

For the two cases you provided:<\/p>\n

if ( 42 == true ) \/\/ false ( Only 1 is true )\nif ( \"Hello World\" == true ) \/\/ false ( false for any string )\n<\/code><\/pre>\n
In case 1, y<\/em> is a Boolean, so it gets converted to a number (step 7). The number conversion of true<\/code> is 1. So now we’re evaluating 42 == 1<\/code>. This is obviously false.<\/p>\n
In case 2, y<\/em> is again a Boolean, but this time, x<\/em> is a string. Per step 7, y<\/em> is converted to a number, so the comparison is now \"Hello World\" == 1<\/code>. Per step 5, x<\/em> is now converted to a number. The numerical representation of an arbitrary string is NaN<\/code>. Now NaN == 1<\/code> is being compared. As it says in step 1ai, that’s false.<\/p>\n
Again, as Crockford said…<\/p>\n<\/p><\/div>\n
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            2<\/span> <\/p><\/div>\n<\/div>\n
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solved How exactly does JavaScipt’s data-type convertion work for “==” operator? <\/p>\n","protected":false},"excerpt":{"rendered":"
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