Comparison operators in JavaScript

#4 of the 40 Essentials of Javascript — The difference between == and ===

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In JavaScript, comparison operators are used to compare values and evaluate conditions in expressions. There are two main comparison operators: the == operator and the === operator. While they may seem similar at first glance, these operators have important differences that can have significant implications.

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Double operator ==

The == operator is used to compare the values of two variables. It performs type coercion, meaning it converts the operands to the same type before making the comparison. For example, "1" == 1 is true because the string "1" is coerced to the number 1.

const foo = 'Polestar'
const baz = 'Polestar'
cosole.log(foo == baz) // => true
cosole.log(foo === baz) // => true

Triple operator ===

On the other hand, the === operator is known as the strict equality operator and it does not perform type coercion. It compares the values of the operands without trying to convert them to a common type. Therefore, "1" === 1 is false because the…