[TypeScript ] Using the Null Coalescing operator with TypeScript 3.7

The postshows you how to use the null coalescing operator (??) instead of logical or (||) to set default values in TypeScript 3.7 to prevent expected bugs in your code.

const val = ;

const correct = (val !== undefined && val !== null) ? val : 0.5;

// const incorrect = val || 0.5; // || check all the falsy value

const incorrect = val ?? 0.5; // ?? check only null and undefined

console.log({ correct, incorrect });

巴特西

[TypeScript ] Using the Null Coalescing operator with TypeScript 3.7

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