[有未看]the abstract equality comparison algorithm, which is also called the type-coercing equality check.

quiz:

// 1st step
false == '0'

// 2nd step
Number(false) == '0' -> 0 == '0'

// 3rd step 0 == '0' -> 0 == Number('0')

// 4th step
0 == 0 -> 0 === 0 -> true

solution:

there is a hierarchy for type coercion in JavaScript. The coercion process follows a set of rules:

1. If either operand is a null or undefined, they are considered equal (unless strict equality is being used with the "===" operator).
   先檢查是否null或undefined
2. If either operand is a boolean, the boolean is converted to a number (false becomes 0, true becomes 1) before comparison.
   布林值轉數字
3. If one operand is a string and the other is a number, the string is converted to a number before comparison.
   字串和數字比的話，字串轉數字
4. If one operand is an object and the other is a primitive value, the object is converted to its primitive value before comparison. This can be done using the valueOf() or toString() methods of the object.
5. If the operands are both strings, they are compared as strings.

後兩個比較深，先跳過