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143 lines (122 loc) · 2.74 KB
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var test = require('../util/test')(__filename);
var reduce = require('../../packages/object-reduce');
var compare = require('../../packages/collection-compare');
var noop = function() {};
noop.toString = function() {
return 'noop function';
};
var obj = {a: 3, b: 5, c: 9, d: null, e: noop};
test('initialValue', function(t) {
t.plan(2);
var expectedKeys = Object.keys(obj);
function getArgsInitialIndex(idx) {
return function() {
if (arguments[3] == idx) {
return [].slice.call(arguments);
}
return arguments[0];
};
}
// Without initialValue
var result1 = reduce(obj, getArgsInitialIndex(1));
t.ok(compare(result1, [3, 'b', 5, 1, expectedKeys]));
// With initialValue
var result2 = reduce(obj, getArgsInitialIndex(0), []);
t.ok(compare(result2, [[], 'a', 3, 0, expectedKeys]));
t.end();
});
test('use value', function(t) {
t.plan(3);
var result1 = reduce(
obj,
function(target, key, value) {
target.push(value);
return target;
},
[]
);
t.ok(compare(result1, [3, 5, 9, null, noop]));
var result2 = reduce(
obj,
function(target, key, value) {
target += Number(value) || 0;
return target;
},
0
);
t.ok(compare(result2, 17));
var result3 = reduce(obj, function(target, key, value) {
target += Number(value) || 0;
return target;
});
t.ok(compare(result3, 17));
t.end();
});
test('use key', function(t) {
t.plan(3);
var result1 = reduce(
obj,
function(target, key, value) {
target.push(key);
return target;
},
[]
);
t.ok(compare(result1, ['a', 'b', 'c', 'd', 'e']));
var result2 = reduce(
obj,
function(target, key, value, index) {
target[index] = key;
return target;
},
{}
);
t.ok(compare(result2, {0: 'a', 1: 'b', 2: 'c', 3: 'd', 4: 'e'}));
var result3 = reduce(obj, function(target, key, value) {
target += key;
return target;
});
t.ok(compare(result3, '3bcde'));
t.end();
});
test('use key and value', function(t) {
t.plan(2);
var expectedResult1 = ['a is 3', 'b is 5', 'c is 9', 'd is null', 'e is noop function'];
var result1 = reduce(
obj,
function(target, key, value) {
target.push(key + ' is ' + value);
return target;
},
[]
);
t.ok(compare(result1, expectedResult1));
var result2 = reduce(
obj,
function(target, key, value) {
target[value] = key;
return target;
},
{}
);
t.ok(
compare(result2, {
3: 'a',
5: 'b',
9: 'c',
null: 'd',
'noop function': 'e',
})
);
t.end();
});
test('invalid usage', function(t) {
t.plan(2);
t.throws(function() {
reduce(obj);
});
t.throws(function() {
reduce({}, noop);
});
t.end();
});