What is Triple Equal in JavaScript?

Javascript uses two different equal signs for equality comparisons. You have abstract and strict equality comparison, or more commonly known as double and triple equal.

The triple equal operator is used to check for strict equality. This means that in order to define two values as equal, both the type and their value must match.

// Here we check for both value and type, therefore this will return false
'1' === 1

Double equal on the other hand only compares values, meaning different types can be equal if their value matches.

// Here we only check for value, therefore will return true:
'1' == 1

When dealing with equality checks, you should always use === to test for equality, otherwise your code may contain unexpected results.

50 JavaScript Interview QuestionsAnd their answers explainedHere are 50 JavaScript interview questions that often come up during a technical interview. In one place, one resource to learn from.Learn More

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Resources:

• Equality comparisons and sameness