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backslash112/index.html

Created May 28, 2018 22:26
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JS Bin // source https://jsbin.com/jelifixubi
Raw
index.html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>JS Bin</title>
</head>
<body>
<script id="jsbin-javascript">
console.log("-------------------------------------------------");
// question 1
const allEquals = arr => {
return arr.every(item => item === arr[0]);
};
const isDual = arr => {
// check the length of array
// if the length is 0 then return true directly
// if the length is a odd number then return false directly
if (arr.length === 0) {
return 1;
} else if (arr.length % 2 === 1) {
return 0;
}
const result = arr.map((item, index) => {
// console.log(index);
if (index % 2 === 0) {
return item + arr[index+1];
} else {
return null;
}
})
.filter(item => item !== null);
// check result are equals
return allEquals(result) ? 1 : 0;
};
// question 2
// solution 1:
function isWeekend1() {
const todayDate = new Date();
const day = todayDate.getDay();
const isWeekend1 = day => day === 0 || day === 6
const isWeekday1 = day => day >= 1 && day <= 5
let week = [day];
const weekday = week.filter(isWeekday1).map(day => "weekday");
const weekend = week.filter(isWeekend1).map(day => "weekdend");
// console.log(weekday.concat(weekend)[0]);
return weekday.concat(weekend)[0];
}
// solution 2:
function isWeekend2() {
const todayDate = new Date();
const day = todayDate.getDay();
return isWeekendByDay(day);
}
function isWeekendByDay(day) {
const map = ["weekend", "weekday", "weekday", "weekday", "weekday", "weekday", "weekend"];
return map[day];
}
// question 3
const applyCoupon = category => {
return coupon => {
return item => {
if (item.category === category) {
let newPrice = item.price * (1 - coupon);
item.price = newPrice;
}
return item;
}
}
};
// unit test
var unitTests = {};
// test isDual()
unitTests.testIsDual1 = function(method) {
return method([]) === 1;
};
unitTests.testIsDual2 = function(method) {
return method([1, 2, 3]) === 0;
};
unitTests.testIsDual3 = function(method) {
return method([1, 2, 3, 0]) === 1;
};
unitTests.testIsDual4 = function(method) {
return method([1, 1, 2, 2]) === 0;
};
// test allEquals()
unitTests.testAllEquals1 = function(method) {
return method([2, 3]) === false;
};
unitTests.testAllEquals2 = function(method) {
return method([3, 3]) === true;
};
// test isWeekend1()
unitTests.testIsWeekend1 = function(method) {
return method() == "weekday";
}
// test isWeekend2()
unitTests.testIsWeekend2 = function(method) {
return method() == "weekday";
}
// test isWeekendByDay()
unitTests.testIsWeekendByDay1 = function(method) {
// 0 is Sunday
return method(0) === "weekend" && method(6) === "weekend";
}
unitTests.testIsWeekendByDay2 = function(method) {
return method(1) === "weekday" && method(5) === "weekday";
}
// test applyCoupon1()
unitTests.testApplyCoupon1 = function(method) {
const item = {
"name": "Biscuits",
"type": "regular",
"category": "food",
"price": 2.0
}
return method("food")(0.1)(item).price === 1.8;
}
console.log("test isDual(): ");
console.log(unitTests.testIsDual1(isDual));
console.log(unitTests.testIsDual2(isDual));
console.log(unitTests.testIsDual3(isDual));
console.log("test allEquals(): ");
console.log(unitTests.testAllEquals1(allEquals));
console.log(unitTests.testAllEquals2(allEquals));
console.log("test isWeekend1(): ");
console.log(unitTests.testIsWeekend1(isWeekend1));
console.log("test isWeekend2(): ");
console.log(unitTests.testIsWeekend2(isWeekend2));
console.log("test isWeekendByDay(): ");
console.log(unitTests.testIsWeekendByDay1(isWeekendByDay) === true);
console.log(unitTests.testIsWeekendByDay2(isWeekendByDay) === true);
console.log("test applyCoupon(): ");
console.log(unitTests.testApplyCoupon1(applyCoupon));
</script>
<script id="jsbin-source-javascript" type="text/javascript">console.log("-------------------------------------------------");
// question 1
const allEquals = arr => {
return arr.every(item => item === arr[0]);
};
const isDual = arr => {
// check the length of array
// if the length is 0 then return true directly
// if the length is a odd number then return false directly
if (arr.length === 0) {
return 1;
} else if (arr.length % 2 === 1) {
return 0;
}
const result = arr.map((item, index) => {
// console.log(index);
if (index % 2 === 0) {
return item + arr[index+1];
} else {
return null;
}
})
.filter(item => item !== null);
// check result are equals
return allEquals(result) ? 1 : 0;
};
// question 2
// solution 1:
function isWeekend1() {
const todayDate = new Date();
const day = todayDate.getDay();
const isWeekend1 = day => day === 0 || day === 6
const isWeekday1 = day => day >= 1 && day <= 5
let week = [day];
const weekday = week.filter(isWeekday1).map(day => "weekday");
const weekend = week.filter(isWeekend1).map(day => "weekdend");
// console.log(weekday.concat(weekend)[0]);
return weekday.concat(weekend)[0];
}
// solution 2:
function isWeekend2() {
const todayDate = new Date();
const day = todayDate.getDay();
return isWeekendByDay(day);
}
function isWeekendByDay(day) {
const map = ["weekend", "weekday", "weekday", "weekday", "weekday", "weekday", "weekend"];
return map[day];
}
// question 3
const applyCoupon = category => {
return coupon => {
return item => {
if (item.category === category) {
let newPrice = item.price * (1 - coupon);
item.price = newPrice;
}
return item;
}
}
};
// unit test
var unitTests = {};
// test isDual()
unitTests.testIsDual1 = function(method) {
return method([]) === 1;
};
unitTests.testIsDual2 = function(method) {
return method([1, 2, 3]) === 0;
};
unitTests.testIsDual3 = function(method) {
return method([1, 2, 3, 0]) === 1;
};
unitTests.testIsDual4 = function(method) {
return method([1, 1, 2, 2]) === 0;
};
// test allEquals()
unitTests.testAllEquals1 = function(method) {
return method([2, 3]) === false;
};
unitTests.testAllEquals2 = function(method) {
return method([3, 3]) === true;
};
// test isWeekend1()
unitTests.testIsWeekend1 = function(method) {
return method() == "weekday";
}
// test isWeekend2()
unitTests.testIsWeekend2 = function(method) {
return method() == "weekday";
}
// test isWeekendByDay()
unitTests.testIsWeekendByDay1 = function(method) {
// 0 is Sunday
return method(0) === "weekend" && method(6) === "weekend";
}
unitTests.testIsWeekendByDay2 = function(method) {
return method(1) === "weekday" && method(5) === "weekday";
}
// test applyCoupon1()
unitTests.testApplyCoupon1 = function(method) {
const item = {
"name": "Biscuits",
"type": "regular",
"category": "food",
"price": 2.0
}
return method("food")(0.1)(item).price === 1.8;
}
console.log("test isDual(): ");
console.log(unitTests.testIsDual1(isDual));
console.log(unitTests.testIsDual2(isDual));
console.log(unitTests.testIsDual3(isDual));
console.log("test allEquals(): ");
console.log(unitTests.testAllEquals1(allEquals));
console.log(unitTests.testAllEquals2(allEquals));
console.log("test isWeekend1(): ");
console.log(unitTests.testIsWeekend1(isWeekend1));
console.log("test isWeekend2(): ");
console.log(unitTests.testIsWeekend2(isWeekend2));
console.log("test isWeekendByDay(): ");
console.log(unitTests.testIsWeekendByDay1(isWeekendByDay) === true);
console.log(unitTests.testIsWeekendByDay2(isWeekendByDay) === true);
console.log("test applyCoupon(): ");
console.log(unitTests.testApplyCoupon1(applyCoupon));
</script></body>
</html>
Raw
jsbin.jelifixubi.js
console.log("-------------------------------------------------");
// question 1
const allEquals = arr => {
return arr.every(item => item === arr[0]);
};
const isDual = arr => {
// check the length of array
// if the length is 0 then return true directly
// if the length is a odd number then return false directly
if (arr.length === 0) {
return 1;
} else if (arr.length % 2 === 1) {
return 0;
}
const result = arr.map((item, index) => {
// console.log(index);
if (index % 2 === 0) {
return item + arr[index+1];
} else {
return null;
}
})
.filter(item => item !== null);
// check result are equals
return allEquals(result) ? 1 : 0;
};
// question 2
// solution 1:
function isWeekend1() {
const todayDate = new Date();
const day = todayDate.getDay();
const isWeekend1 = day => day === 0 || day === 6
const isWeekday1 = day => day >= 1 && day <= 5
let week = [day];
const weekday = week.filter(isWeekday1).map(day => "weekday");
const weekend = week.filter(isWeekend1).map(day => "weekdend");
// console.log(weekday.concat(weekend)[0]);
return weekday.concat(weekend)[0];
}
// solution 2:
function isWeekend2() {
const todayDate = new Date();
const day = todayDate.getDay();
return isWeekendByDay(day);
}
function isWeekendByDay(day) {
const map = ["weekend", "weekday", "weekday", "weekday", "weekday", "weekday", "weekend"];
return map[day];
}
// question 3
const applyCoupon = category => {
return coupon => {
return item => {
if (item.category === category) {
let newPrice = item.price * (1 - coupon);
item.price = newPrice;
}
return item;
}
}
};
// unit test
var unitTests = {};
// test isDual()
unitTests.testIsDual1 = function(method) {
return method([]) === 1;
};
unitTests.testIsDual2 = function(method) {
return method([1, 2, 3]) === 0;
};
unitTests.testIsDual3 = function(method) {
return method([1, 2, 3, 0]) === 1;
};
unitTests.testIsDual4 = function(method) {
return method([1, 1, 2, 2]) === 0;
};
// test allEquals()
unitTests.testAllEquals1 = function(method) {
return method([2, 3]) === false;
};
unitTests.testAllEquals2 = function(method) {
return method([3, 3]) === true;
};
// test isWeekend1()
unitTests.testIsWeekend1 = function(method) {
return method() == "weekday";
}
// test isWeekend2()
unitTests.testIsWeekend2 = function(method) {
return method() == "weekday";
}
// test isWeekendByDay()
unitTests.testIsWeekendByDay1 = function(method) {
// 0 is Sunday
return method(0) === "weekend" && method(6) === "weekend";
}
unitTests.testIsWeekendByDay2 = function(method) {
return method(1) === "weekday" && method(5) === "weekday";
}
// test applyCoupon1()
unitTests.testApplyCoupon1 = function(method) {
const item = {
"name": "Biscuits",
"type": "regular",
"category": "food",
"price": 2.0
}
return method("food")(0.1)(item).price === 1.8;
}
console.log("test isDual(): ");
console.log(unitTests.testIsDual1(isDual));
console.log(unitTests.testIsDual2(isDual));
console.log(unitTests.testIsDual3(isDual));
console.log("test allEquals(): ");
console.log(unitTests.testAllEquals1(allEquals));
console.log(unitTests.testAllEquals2(allEquals));
console.log("test isWeekend1(): ");
console.log(unitTests.testIsWeekend1(isWeekend1));
console.log("test isWeekend2(): ");
console.log(unitTests.testIsWeekend2(isWeekend2));
console.log("test isWeekendByDay(): ");
console.log(unitTests.testIsWeekendByDay1(isWeekendByDay) === true);
console.log(unitTests.testIsWeekendByDay2(isWeekendByDay) === true);
console.log("test applyCoupon(): ");
console.log(unitTests.testApplyCoupon1(applyCoupon));
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