strict equality (===)

equality without type conversion.

JS ⟩ statement ⟩ expression ⟩ operator ⟩ relational ⟩ strict (===)

compares two values, without type conversion.

synonyms： ”identity operator"

compare： sloppy equality (==)

<= and >= do not rely on == or ===

the comparison between switch (expr) and a case clause is done by "===".

replit： strict equality (===)

// (different types)
null === undefined,  // false
0    === '0',        // false
0    === false,      // false
1    === true,       // false
'1'  === true,       // false
'0'  === false,      // false 

// (same type, different instannces)
Symbol() === Symbol(),    // false (different symbols)
{a: 1} === {a: 1},        // false (different objects)

// ⭐️ computer math is not perfect!
0.1 + 0.2,           // 0.30000000000000004
0.1 + 0.2 === 0.3,   // false❗

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Last updated 2 years ago

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