68 lines
4.1 KiB
TypeScript
68 lines
4.1 KiB
TypeScript
//// [arrayLiterals3.ts]
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// Each element expression in a non-empty array literal is processed as follows:
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// - If the array literal contains no spread elements, and if the array literal is contextually typed (section 4.19)
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// by a type T and T has a property with the numeric name N, where N is the index of the element expression in the array literal,
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// the element expression is contextually typed by the type of that property.
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// The resulting type an array literal expression is determined as follows:
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// - If the array literal contains no spread elements and is contextually typed by a tuple-like type,
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// the resulting type is a tuple type constructed from the types of the element expressions.
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var a0: [any, any, any] = []; // Error
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var a1: [boolean, string, number] = ["string", 1, true]; // Error
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// The resulting type an array literal expression is determined as follows:
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// - If the array literal contains no spread elements and is an array assignment pattern in a destructuring assignment (section 4.17.1),
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// the resulting type is a tuple type constructed from the types of the element expressions.
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var [b1, b2]: [number, number] = [1, 2, "string", true];
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// The resulting type an array literal expression is determined as follows:
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// - the resulting type is an array type with an element type that is the union of the types of the
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// non - spread element expressions and the numeric index signature types of the spread element expressions
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var temp = ["s", "t", "r"];
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var temp1 = [1, 2, 3];
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var temp2: [number[], string[]] = [[1, 2, 3], ["hello", "string"]];
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interface tup {
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0: number[]|string[];
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1: number[]|string[];
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}
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interface myArray extends Array<Number> { }
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interface myArray2 extends Array<Number|String> { }
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var c0: tup = [...temp2]; // Error
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var c1: [number, number, number] = [...temp1]; // Error cannot assign number[] to [number, number, number]
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var c2: myArray = [...temp1, ...temp]; // Error cannot assign (number|string)[] to number[]
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//// [arrayLiterals3.js]
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// Each element expression in a non-empty array literal is processed as follows:
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// - If the array literal contains no spread elements, and if the array literal is contextually typed (section 4.19)
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// by a type T and T has a property with the numeric name N, where N is the index of the element expression in the array literal,
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// the element expression is contextually typed by the type of that property.
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var __spreadArrays = (this && this.__spreadArrays) || function () {
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for (var s = 0, i = 0, il = arguments.length; i < il; i++) s += arguments[i].length;
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for (var r = Array(s), k = 0, i = 0; i < il; i++)
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for (var a = arguments[i], j = 0, jl = a.length; j < jl; j++, k++)
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r[k] = a[j];
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return r;
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};
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// The resulting type an array literal expression is determined as follows:
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// - If the array literal contains no spread elements and is contextually typed by a tuple-like type,
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// the resulting type is a tuple type constructed from the types of the element expressions.
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var a0 = []; // Error
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var a1 = ["string", 1, true]; // Error
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// The resulting type an array literal expression is determined as follows:
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// - If the array literal contains no spread elements and is an array assignment pattern in a destructuring assignment (section 4.17.1),
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// the resulting type is a tuple type constructed from the types of the element expressions.
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var _a = [1, 2, "string", true], b1 = _a[0], b2 = _a[1];
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// The resulting type an array literal expression is determined as follows:
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// - the resulting type is an array type with an element type that is the union of the types of the
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// non - spread element expressions and the numeric index signature types of the spread element expressions
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var temp = ["s", "t", "r"];
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var temp1 = [1, 2, 3];
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var temp2 = [[1, 2, 3], ["hello", "string"]];
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var c0 = __spreadArrays(temp2); // Error
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var c1 = __spreadArrays(temp1); // Error cannot assign number[] to [number, number, number]
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var c2 = __spreadArrays(temp1, temp); // Error cannot assign (number|string)[] to number[]
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