Does type conversion have a specific ranking of preference?

When working with JavaScript, it's important to note that the language automatically converts types when necessary. For instance, if you have an expression like "8" * "3", JavaScript will convert the strings to numbers and calculate the result as 24. But what happens when comparing two different types in JavaScript? Which type gets converted first?

Consider this example:

When the string "true" is compared with the boolean true, one of them needs to be converted to the other type. The question is, does the "true" string get converted to a boolean true, which would return a boolean object, or does the boolean true convert to the "true" string?

In this case, my guess is that the "true" string is converted to a boolean true, making the statement false. But why is this the case? Is there a preference in type conversion that determines this outcome?

Answer №1

For more information on the Abstract Equality Comparison Algorithm, check out this link.

In essence, the double equals operator (==) has its own unique magic; it tends to favor conversion to a numeric value using the ToNumber function. This conversion happens as a result of the equality operator's evaluation.

"true" == true
"true" == 1      // according to rule #7   - converting true to a number
0 == 1           // following rule #5   - converting "true" to a number
false            // based on rule #1c

The ToBoolean operation is not utilized in this scenario, unlike other situations where truthiness plays a role - such as with logical boolean operators or conditionals.

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