311 lines
7.4 KiB
JavaScript
311 lines
7.4 KiB
JavaScript
let x = 7;
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console.log(Number.isNaN(x));
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console.log(isNaN(x));
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let uri = "https://www.example.com/submit?name=maaike van putten";
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let encoded_uri = encodeURI(uri);
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console.log("Encoded:", encoded_uri);
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let decoded_uri = decodeURI(encoded_uri);
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console.log("Decoded:", decoded_uri);
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let uri = "https://www.example.com/submit?name=maaike van putten";
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let encoded_uri = encodeURIComponent(uri);
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console.log("Encoded:", encoded_uri);
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let decoded_uri = decodeURIComponent(encoded_uri);
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console.log("Decoded:", decoded_uri);
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//parseint
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let str_int = "6";
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let int_int = parseInt(str_int);
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console.log("Type of", int_int, "is", typeof int_int);
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let str_float = "7.6";
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let int_float = parseInt(str_float);
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console.log("Type of", int_float, "is", typeof int_float);
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let str_binary = "0b101";
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let int_binary = parseInt(str_binary);
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console.log("Type of", int_binary, "is", typeof int_binary);
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let str_nan = "hello!";
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let int_nan = parseInt(str_nan);
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console.log("Type of", int_nan, "is", typeof int_nan);
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//parsefloat
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let str_float = "7.6";
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let float_float = parseFloat(str_float);
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console.log("Type of", float_float, "is", typeof float_float);
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let str_version_nr = "2.3.4";
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let float_version_nr = parseFloat(str_version_nr);
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console.log("Type of", float_version_nr, "is", typeof float_version_nr);
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let str_int = "6";
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let float_int = parseFloat(str_int);
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console.log("Type of", float_int, "is", typeof float_int);
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let str_binary = "0b101";
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let float_binary = parseFloat(str_binary);
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console.log("Type of", float_binary, "is", typeof float_binary);
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let str_nan = "hello!";
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let float_nan = parseFloat(str_nan);
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console.log("Type of", float_nan, "is", typeof float_nan);
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// concat() and split()
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let s1 = "Hello ";
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let s2 = "JavaScript";
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let result = s1.concat(s2);
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console.log(result);
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let arr_result = result.split(" ");
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console.log(arr_result);
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let favoriteFruits = "strawberry,watermelon,grapefruit";
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let arr_fruits = favoriteFruits.split(",");
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console.log(arr_fruits);
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// indexOf() and lastIndexOf() and charAt()
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let poem = "Roses are red, violets are blue, if I can do JS, then you can too!";
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let index_re = poem.indexOf("re");
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console.log(index_re);
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let indexNotFound = poem.indexOf("python");
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console.log(indexNotFound);
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let lastIndex_re = poem.lastIndexOf("re");
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console.log(lastIndex_re);
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let pos1 = poem.charAt(10);
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console.log(pos1);
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let pos2 = poem.charAt(1000);
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console.log(pos2);
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//slice
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let str = "Baby shark";
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let substr1 = str.slice(5);
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let substr2 = str.slice(0,3);
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console.log("1:", substr1);
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console.log("2:", substr2);
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// replace()
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let hi = "Hi buddy";
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let new_hi = hi.replace("buddy", "Pascal");
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console.log(new_hi);
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let new_hi2 = hi.replace("not there", "never there");
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console.log(new_hi2);
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//replace only all, first first we'll need regex
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let s3 = "hello hello";
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let new_s3 = s3.replace("hello", "oh");
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console.log(new_s3);
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// toLowerCase() and toUpperCase()
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let low_bye = "bye!";
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let up_bye = low_bye.toUpperCase();
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console.log(up_bye);
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let caps = "HI HOW ARE YOU?";
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let fixed_caps = caps.toLowerCase();
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console.log(fixed_caps);
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// startsWith() and endsWith()
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let encouragement = "You are doing great, keep up the good work!";
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let bool_start = encouragement.startsWith("You");
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console.log(bool_start);
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let bool_start2 = encouragement.startsWith("you");
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console.log(bool_start2);
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let bool_start3 = encouragement.toLowerCase().startsWith("you");
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console.log(bool_start3);
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let bool_end = encouragement.endsWith("Something else");
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console.log(bool_end);
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// search()
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let searchStr = "When I see my fellow, I say hello";
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let pos = searchStr.search("lo");
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console.log(pos);
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let notFound = searchStr.search("JavaScript");
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console.log(notFound);
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//Math
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// Max() and min()
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let highest = Math.max(2, 56, 12, 1, 233, 4);
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console.log(highest);
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let lowest = Math.min(2, 56, 12, 1, 233, 4);
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console.log(lowest);
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//NaN
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let highestOfWords = Math.max("hi", "bye");
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console.log(highestOfWords);
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// sqrt() and pow()
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let result = Math.sqrt(64);
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console.log(result);
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let result2 = Math.pow(5, 3);
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console.log(result2);
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// Ceil() and floor() and trunc() and round()
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let x = 6.78;
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let y = 5.34;
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console.log("X:", x, "becomes", Math.round(x));
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console.log("Y:", y, "becomes", Math.round(y));
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console.log("X:", x, "becomes", Math.ceil(x));
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console.log("Y:", y, "becomes", Math.ceil(y));
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let negativeX = -x;
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let negativeY = -y;
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console.log("negativeX:", negativeX, "becomes", Math.ceil(negativeX));
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console.log("negativeY:", negativeY, "becomes", Math.ceil(negativeY));
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console.log("X:", x, "becomes", Math.floor(x));
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console.log("Y:", y, "becomes", Math.floor(y));
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console.log("negativeX:", negativeX, "becomes", Math.floor(negativeX));
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console.log("negativeY:", negativeY, "becomes", Math.floor(negativeY));
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console.log("X:", x, "becomes", Math.trunc(x));
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console.log("Y:", y, "becomes", Math.trunc(y));
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// Exp() and log10()
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let x = 2;
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let exp = Math.exp(2);
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console.log("Exp:", exp);
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let log = Math.log(exp);
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console.log("Log:", log);
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// Date
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// Create date: constructor and now
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let now = new Date();
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let now2 = Date.now();
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let milliDate = new Date(1000);
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let stringDate = new Date("Sat Jun 05 2021 12:40:12 GMT+0200");
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let specificDate = new Date(2022, 1, 10, 12, 10, 15, 100);
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console.log(now);
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console.log(now2);
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console.log(milliDate);
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console.log(stringDate);
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console.log(specificDate);
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// Methods to get and set the elements of a date
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let d = new Date();
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console.log("Day:", d.getDay());
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console.log("Month:", d.getMonth());
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console.log("Year:", d.getFullYear());
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console.log("Seconds:", d.getSeconds());
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console.log("Milliseconds:", d.getMilliseconds());
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console.log("Time:", d.getTime());
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d.setFullYear(2010);
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console.log(d);
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d.setMonth(9);
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console.log(d);
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d.setDate(10);
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console.log(d);
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d.setHours(10);
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console.log(d);
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d.setMinutes(10);
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console.log(d);
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d.setSeconds(10);
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console.log(d);
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d.setMilliseconds(10);
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console.log(d);
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d.setTime(1622889770682);
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console.log(d);
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// Parse() date
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let d1 = Date.parse("June 5, 2021");
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console.log(d1);
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let d2 = Date.parse("6/5/2021");
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console.log(d2);
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// Convert date to string
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console.log(d.toDateString());
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console.log(d.toLocaleDateString);
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// Array
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let arr = ["grapefruit", 4, "hello", 5.6, true];
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// foreach() method
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function printStuff(element, index) {
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console.log("Printing stuff:", element, "on array position:", index);
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}
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arr.forEach(printStuff);
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// filter() method
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function checkString(element, index) {
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return typeof element === "string";
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}
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let filterArr = arr.filter(checkString);
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console.log(filterArr);
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// every() method
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console.log(arr.every(checkString)); //false not all string
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// copyWithin() method
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// copy to pos 0 the element at pos 3 to the end
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let arr = ["grapefruit", 4, "hello", 5.6, true];
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arr.copyWithin(0, 3);
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arr = ["grapefruit", 4, "hello", 5.6, true];
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// copy to pos 0 the element at pos 3
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arr.copyWithin(0, 3, 4);
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// lastIndexOf() method
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let bb = ["so", "bye", "bye", "love"];
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console.log(bb.lastIndexOf("bye"));
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// join() method
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let letters = ["a", "b", "c"];
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let x = letters.join();
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console.log(x);
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// Number
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// isNaN()
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let x = 34;
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console.log(isNaN(x));
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let str = "hi";
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console.log(isNaN(str));
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// isFinite()
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console.log(isFinite(x));
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console.log(isFinite(str));
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console.log(isFinite(Infinity));
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console.log(isFinite(10 / 0));
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// isInteger()
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console.log(Number.isInteger(x));
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console.log(Number.isInteger(str));
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console.log(Number.isInteger(Infinity));
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console.log(Number.isInteger(2.4));
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// toFixed()
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let x = 1.23456;
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let newX = x.toFixed(2); // 2 decimals
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// toPrecision()
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let x = 1.23456;
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let newX = x.toPrecision(2); //2 numbers
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