Search code examples
javascriptcomparison

Javascript: the confuse about comparison "2 == true"

Here is a javascript comparison:

2 == true //false

it's said, the reason why return false, is because the comparison convert the true to Number datatype, and result is 1:

console.info(Number(true)) // 1

My confuse is, why the comparison don't convert the number 2 to Boolean datatype

console.info(Boolean(2)) // true

and the 2 == true result could be true ?

Solution

  • I find the doc here:

    Comparison Operators, which said:

    If the two operands are not of the same type, JavaScript converts the operands then applies strict comparison. If either operand is a number or a boolean, the operands are converted to numbers if possible; else if either operand is a string, the other operand is converted to a string if possible. If both operands are objects, then JavaScript compares internal references which are equal when operands refer to the same object in memory.