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dagda1/foo.ts

Last active June 21, 2019 16:40
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foo.ts
interface Foo {
value?: string;
}
const item1: Foo = { value: 'foo' }
// ERROR: Object is possibly 'undefined'.
console.log(`Message ${item1.value.substring(4)}`);
const item2 = { value: 'foo' }
// all good in the hood
console.log(`Message ${item2.value.substring(4)}`);
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