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getters.js
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getters.js
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import { test, summary } from './helpers.js';
console.log('Getter/Setter Tests\n');
let obj1 = {
get value() {
return 42;
}
};
test('basic getter', obj1.value, 42);
let obj2 = {
_count: 0,
get count() {
return this._count;
},
set count(val) {
this._count = val;
}
};
test('getter initial value', obj2.count, 0);
obj2.count = 10;
test('setter updates value', obj2.count, 10);
let obj3 = {
firstName: 'John',
lastName: 'Doe',
get fullName() {
return this.firstName + ' ' + this.lastName;
}
};
test('computed getter', obj3.fullName, 'John Doe');
let obj4 = {
get 'special-key'() {
return 'special';
}
};
test('string key getter', obj4['special-key'], 'special');
let obj5 = {
get 0() {
return 'zero';
}
};
test('number key getter', obj5[0], 'zero');
let obj6 = {
_x: 0,
_y: 0,
get x() {
return this._x;
},
set x(v) {
this._x = v;
},
get y() {
return this._y;
},
set y(v) {
this._y = v;
}
};
obj6.x = 5;
obj6.y = 10;
test('multiple getters x', obj6.x, 5);
test('multiple getters y', obj6.y, 10);
let obj7 = {
get data() {
return { a: 1, b: 2 };
}
};
test('getter returns object', obj7.data.a, 1);
let obj8 = {
_age: 0,
get age() {
return this._age;
},
set age(val) {
if (val < 0) val = 0;
this._age = val;
}
};
obj8.age = -5;
test('setter validation', obj8.age, 0);
obj8.age = 25;
test('setter valid value', obj8.age, 25);
let obj9 = {
get readonly() {
return 'constant';
}
};
test('getter-only read', obj9.readonly, 'constant');
obj9.readonly = 'changed';
test('getter-only unchanged', obj9.readonly, 'constant');
let strictError = (function () {
'use strict';
try {
let strictObj = {
get x() {
return 1;
}
};
strictObj.x = 2;
return false;
} catch (e) {
return e instanceof TypeError;
}
})();
test('strict mode getter-only throws', strictError, true);
let obj10 = {
multiplier: 3,
_value: 7,
get computed() {
return this._value * this.multiplier;
}
};
test('getter with this', obj10.computed, 21);
let sideEffect = 0;
let obj11 = {
set trigger(val) {
sideEffect = val * 2;
}
};
obj11.trigger = 5;
test('setter side effect', sideEffect, 10);
summary();

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getters.js (2 KB)

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