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memorize.ai (lvl 286)

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JavaScript == and ===

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HTML Web Dev

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Mar 1, 2020

Cards (7)

Section 1

(7 cards)

JavaScript == and ===

Front

== loosely equal with type coercion === both type and value

Back

Difference between Java and Typescript in typing system?

Front

Java: nominal typing Typescript: structural

Back

How to do type guard using typeof in JavaScript?

Front

typeof foo === "string" Only string, number, boolean and symbol are allowed.

Back

for..of example?

Front

for (let val of some_array) {...}

Back

What's the @ sign in import file path?

Front

It has to do with the rootPathPrefix of babel-plugin-root-import.

Back

null, undefined and the billion dollar mistake?

Front

Tony Hoare invented null in 1965.

Back

for..of and for..in difference?

Front

of: values in: keys

Back