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//// [destructuringParameterDeclaration2.ts]
// A parameter declaration may specify either an identifier or a binding pattern.
// The identifiers specified in parameter declarations and binding patterns
// in a parameter list must be unique within that parameter list.
// If the declaration includes a type annotation, the parameter is of that type
function a0([a, b, [[c]]]: [number, number, string[][]]) { }
a0([1, "string", [["world"]]); // Error
a0([1, 2, [["world"]], "string"]); // Error
// If the declaration includes an initializer expression (which is permitted only
// when the parameter list occurs in conjunction with a function body),
// the parameter type is the widened form (section 3.11) of the type of the initializer expression.
interface F1 {
b0(z = 10, [[a, b], d, {u}] = [[1, 2], "string", { u: false }]); // Error, no function body
}
function b1(z = null, o = { x: 0, y: undefined }) { }
function b2([a, z, y] = [undefined, null, undefined]) { }
function b3([[a], b, [[c, d]]] = [[undefined], undefined, [[undefined, undefined]]]) { }
b1("string", { x: "string", y: true }); // Error
// If the declaration specifies a binding pattern, the parameter type is the implied type of that binding pattern (section 5.1.3)
function c0({z: {x, y: {j}}}) { }
function c1({z} = { z: 10 }) { }
function c2({z = 10}) { }
function c3({b}: { b: number|string } = { b: "hello" }) { }
function c4([z], z: number) { } // Error Duplicate identifier
function c5([a, b, [[c]]]) { }
function c6([a, b, [[c = 1]]]) { }
c0({ z: 1 }); // Error, implied type is { z: {x: any, y: {j: any}} }
c1({}); // Error, implied type is {z:number}?
c1({ z: true }); // Error, implied type is {z:number}?
c2({ z: false }); // Error, implied type is {z?: number}
c3({ b: true }); // Error, implied type is { b: number|string }.
c5([1, 2, false, true]); // Error, implied type is [any, any, [[any]]]
c6([1, 2, [["string"]]]); // Error, implied type is [any, any, [[number]]] // Use initializer
// A parameter can be marked optional by following its name or binding pattern with a question mark (?)
// or by including an initializer. Initializers (including binding property or element initializers) are
// permitted only when the parameter list occurs in conjunction with a function body
function d1([a, b, c]?) { } // Error, binding pattern can't be optional in implementation signature
function d2({x, y, z}?) { } // Error, binding pattern can't be optional in implementation signature
interface F2 {
d3([a, b, c]?);
d4({x, y, z}?);
e0([a, b, c]);
}
class C4 implements F2 {
d3([a, b, c]?) { } // Error, binding pattern can't be optional in implementation signature
d4({x, y, c}) { }
e0([a, b, q]) { }
}
// Destructuring parameter declarations do not permit type annotations on the individual binding patterns,
// as such annotations would conflict with the already established meaning of colons in object literals.
// Type annotations must instead be written on the top- level parameter declaration
function e0({x: [number, number, number]}) { } // error, duplicate identifier;
//// [destructuringParameterDeclaration2.js]
// A parameter declaration may specify either an identifier or a binding pattern.
// The identifiers specified in parameter declarations and binding patterns
// in a parameter list must be unique within that parameter list.
// If the declaration includes a type annotation, the parameter is of that type
function a0(_a) {
var a = _a[0], b = _a[1], c = _a[2][0][0];
}
a0([1, "string", [["world"]]]); // Error
a0([1, 2, [["world"]], "string"]); // Error
function b1(z, o) {
if (z === void 0) { z = null; }
if (o === void 0) { o = { x: 0, y: undefined }; }
}
function b2(_a) {
var _b = _a === void 0 ? [undefined, null, undefined] : _a, a = _b[0], z = _b[1], y = _b[2];
}
function b3(_a) {
var _b = _a === void 0 ? [[undefined], undefined, [[undefined, undefined]]] : _a, a = _b[0][0], b = _b[1], _c = _b[2][0], c = _c[0], d = _c[1];
}
b1("string", { x: "string", y: true }); // Error
// If the declaration specifies a binding pattern, the parameter type is the implied type of that binding pattern (section 5.1.3)
function c0(_a) {
var _b = _a.z, x = _b.x, j = _b.y.j;
}
function c1(_a) {
var z = (_a === void 0 ? { z: 10 } : _a).z;
}
function c2(_a) {
var _b = _a.z, z = _b === void 0 ? 10 : _b;
}
function c3(_a) {
var b = (_a === void 0 ? { b: "hello" } : _a).b;
}
function c4(_a, z) {
var z = _a[0];
} // Error Duplicate identifier
function c5(_a) {
var a = _a[0], b = _a[1], c = _a[2][0][0];
}
function c6(_a) {
var a = _a[0], b = _a[1], _b = _a[2][0][0], c = _b === void 0 ? 1 : _b;
}
c0({ z: 1 }); // Error, implied type is { z: {x: any, y: {j: any}} }
c1({}); // Error, implied type is {z:number}?
c1({ z: true }); // Error, implied type is {z:number}?
c2({ z: false }); // Error, implied type is {z?: number}
c3({ b: true }); // Error, implied type is { b: number|string }.
c5([1, 2, false, true]); // Error, implied type is [any, any, [[any]]]
c6([1, 2, [["string"]]]); // Error, implied type is [any, any, [[number]]] // Use initializer
// A parameter can be marked optional by following its name or binding pattern with a question mark (?)
// or by including an initializer. Initializers (including binding property or element initializers) are
// permitted only when the parameter list occurs in conjunction with a function body
function d1(_a) {
var a = _a[0], b = _a[1], c = _a[2];
} // Error, binding pattern can't be optional in implementation signature
function d2(_a) {
var x = _a.x, y = _a.y, z = _a.z;
} // Error, binding pattern can't be optional in implementation signature
var C4 = /** @class */ (function () {
function C4() {
}
C4.prototype.d3 = function (_a) {
var a = _a[0], b = _a[1], c = _a[2];
}; // Error, binding pattern can't be optional in implementation signature
C4.prototype.d4 = function (_a) {
var x = _a.x, y = _a.y, c = _a.c;
};
C4.prototype.e0 = function (_a) {
var a = _a[0], b = _a[1], q = _a[2];
};
return C4;
}());
// Destructuring parameter declarations do not permit type annotations on the individual binding patterns,
// as such annotations would conflict with the already established meaning of colons in object literals.
// Type annotations must instead be written on the top- level parameter declaration
function e0(_a) {
var _b = _a.x, number = _b[0], number = _b[1], number = _b[2];
} // error, duplicate identifier;
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