49 lines
1.2 KiB
JavaScript
49 lines
1.2 KiB
JavaScript
//// [additionOperatorWithUndefinedValueAndInvalidOperands.ts]
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// If one operand is the null or undefined value, it is treated as having the type of the other operand.
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function foo(): void { return undefined }
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var a: boolean;
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var b: Object;
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var c: void;
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var d: Number;
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// undefined + boolean/Object
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var r1 = undefined + a;
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var r2 = undefined + b;
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var r3 = undefined + c;
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var r4 = a + undefined;
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var r5 = b + undefined;
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var r6 = undefined + c;
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// other cases
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var r7 = undefined + d;
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var r8 = undefined + true;
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var r9 = undefined + { a: '' };
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var r10 = undefined + foo();
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var r11 = undefined + (() => { });
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//// [additionOperatorWithUndefinedValueAndInvalidOperands.js]
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// If one operand is the null or undefined value, it is treated as having the type of the other operand.
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function foo() {
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return undefined;
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}
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var a;
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var b;
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var c;
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var d;
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// undefined + boolean/Object
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var r1 = undefined + a;
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var r2 = undefined + b;
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var r3 = undefined + c;
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var r4 = a + undefined;
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var r5 = b + undefined;
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var r6 = undefined + c;
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// other cases
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var r7 = undefined + d;
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var r8 = undefined + true;
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var r9 = undefined + { a: '' };
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var r10 = undefined + foo();
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var r11 = undefined + (function () {
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});
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