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joanllenas/nullable-types.ts

Created March 4, 2017 22:55
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TS nullable types
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nullable-types.ts
// The compiler has the --strictNullChecks flag set
let cannotBeNull = "I can't be null nor undefined";
cannotBeNull = null; // error, 'null' is not assignable to 'string'
cannotBeNull = undefined; // error, 'undefined' is not assignable to 'string'
let nullable: string | null = "I can be null but not undefined";
nullable = null;
nullable = undefined; // error, 'undefined' is not assignable to 'string | null'
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