javascript double equals vs triple equals

in javascript, the `==` and `===` operators are used for comparison. the main difference between the two is how they handle type coercion.

1. double equals (`==`): the double equals operator compares two values for equality after converting them to a common type. it performs type coercion before making the comparison. this means that if the two values being compared are of different data types, javascript will attempt to convert one or both values to a common type before making the comparison.

2. triple equals (`===`): the triple equals operator also compares two values for equality, but it does not perform any type coercion. it checks for both value and data type equality. this means that the values being compared must be of the same type to be considered equal.

here's an example to illustrate the difference between `==` and `===`:

in the example above, `num1` is a number and `num2` is a string that represents the same number. when using `==`, javascript converts the string `'10'` to a number `10` before comparing them, so the comparison returns `true`. however, when using `===`, the comparison returns `false` because they are of different types.

it is generally recommended to use `===` for strict equality checks to avoid unexpected behavior due to type coercion. however, there are cases where `==` might be more suitable, such as when checking for `null` or `undefined`.

remember to choose the appropriate operator based on your specific use case to ensure accurate and predictable comparisons in your javascript code.

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