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ant/tests/test_arrow_this.cjs
ddfe6237cab5feature/nursery

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test_arrow_this.cjs
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// Test arrow function 'this' binding - arrows capture 'this' from surrounding scope
// Test 1: Arrow inside regular function captures outer this
let obj1 = {
name: "test",
regular() { return this.name; },
method() {
let inner = () => this.name;
return inner();
}
};
console.log("Test 1a - regular function this:", obj1.regular()); // Should be "test"
console.log("Test 1b - arrow captures outer this:", obj1.method()); // Should be "test"
// Test 2: Nested arrows maintain lexical this
let obj2 = {
value: 42,
outer() {
let first = () => {
let second = () => this.value;
return second();
};
return first();
}
};
console.log("Test 2 - nested arrows:", obj2.outer()); // Should be 42
// Test 3: Arrow in callback maintains this
let obj3 = {
items: [1, 2, 3],
multiplier: 10,
process() {
let results = [];
let self = this;
for (let i = 0; i < this.items.length; i++) {
let fn = () => self.items[i] * self.multiplier;
results[i] = fn();
}
return results;
}
};
let result3 = obj3.process();
console.log("Test 3 - arrow in loop:", result3[0], result3[1], result3[2]); // Should be 10 20 30
// Test 4: Arrow function stored and called later still uses captured this
let obj4 = {
secret: "hidden",
getGetter() {
return () => this.secret;
}
};
let getter = obj4.getGetter();
console.log("Test 4 - stored arrow:", getter()); // Should be "hidden"
// Test 5: Arrow passed to different object still uses captured this
let obj5 = {
id: "obj5",
arrow() {
return () => this.id;
}
};
let arrowFromObj5 = obj5.arrow();
let obj6 = { id: "obj6", stolenArrow: arrowFromObj5 };
console.log("Test 5 - arrow keeps original this:", obj6.stolenArrow()); // Should still be "obj5"
console.log("\nAll arrow function this tests completed!");

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