Nullable Values and Safe Access

Nullish Coalescing

Nullish coalescing chooses a fallback only for null or undefined.

Nullish Coalescing

coalescing.ts 
const displayName: string | undefined = ;
const fallbackName: string = "Guest";
const nameToShow: string = displayName ?? fallbackName;

console.log(`hello=${nameToShow}`);

const displayName: string | undefined = ;
const fallbackName: string = "Guest";
const nameToShow: string = displayName ?? fallbackName;

console.log(`hello=${nameToShow}`);

const displayName: string | undefined = ;
const fallbackName: string = "Guest";
const nameToShow: string = displayName ?? fallbackName;

console.log(`hello=${nameToShow}`);
nullish coalescing The `??` operator keeps real values, but replaces `null` or `undefined` with a fallback.