101 lines
3.3 KiB
Text
101 lines
3.3 KiB
Text
=== tests/cases/conformance/expressions/arrayLiterals/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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>a0 : [any, any, any]
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>[] : undefined[]
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var a1: [boolean, string, number] = ["string", 1, true]; // Error
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>a1 : [boolean, string, number]
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>["string", 1, true] : [string, number, boolean]
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>"string" : "string"
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>1 : 1
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>true : true
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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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>b1 : number
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>b2 : number
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>[1, 2, "string", true] : [number, number, string, boolean]
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>1 : 1
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>2 : 2
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>"string" : "string"
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>true : 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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>temp : string[]
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>["s", "t", "r"] : string[]
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>"s" : "s"
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>"t" : "t"
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>"r" : "r"
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var temp1 = [1, 2, 3];
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>temp1 : number[]
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>[1, 2, 3] : number[]
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>1 : 1
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>2 : 2
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>3 : 3
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var temp2: [number[], string[]] = [[1, 2, 3], ["hello", "string"]];
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>temp2 : [number[], string[]]
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>[[1, 2, 3], ["hello", "string"]] : [number[], string[]]
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>[1, 2, 3] : number[]
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>1 : 1
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>2 : 2
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>3 : 3
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>["hello", "string"] : string[]
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>"hello" : "hello"
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>"string" : "string"
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interface tup {
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>tup : 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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>myArray : myArray
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>Array : T[]
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>Number : Number
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interface myArray2 extends Array<Number|String> { }
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>myArray2 : myArray2
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>Array : T[]
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>Number : Number
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>String : String
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var c0: tup = [...temp2]; // Error
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>c0 : tup
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>tup : tup
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>[...temp2] : (number[] | string[])[]
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>...temp2 : number[] | string[]
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>temp2 : [number[], string[]]
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var c1: [number, number, number] = [...temp1]; // Error cannot assign number[] to [number, number, number]
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>c1 : [number, number, number]
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>[...temp1] : number[]
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>...temp1 : number
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>temp1 : number[]
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var c2: myArray = [...temp1, ...temp]; // Error cannot assign (number|string)[] to number[]
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>c2 : myArray
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>myArray : myArray
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>[...temp1, ...temp] : (string | number)[]
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>...temp1 : number
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>temp1 : number[]
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>...temp : string
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>temp : string[]
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