jobbet litt med arrow functions

eloquentjavascript/05_higher_order_functions/filter_arrays.js

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+const SCRIPTS = require('./scripts');
+
+require('./scripts.js');
+
+function filter(array, test){
+    let passed = [];
+    for (let element of array){
+        if(test(element)) {
+            passed.push(element);
+        }
+    }
+    return passed
+}
+//console.log(filter(SCRIPTS, script => script.living));
+function map(array, transform){
+    let mapped = [];
+    for (let element of array) {
+        mapped.push(transform(element));
+    }
+    return mapped
+}
+let rtlScripts = SCRIPTS.filter(s => s.direction == "rtl");
+console.log(map(rtlScripts, s => s.name));

eloquentjavascript/05_higher_order_functions/test.js

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+let total = 0, count = 1;
+while (count < 10) {
+    total += count;
+    count += 1;
+}
+
+// for (let i = 0; i < 10; i++){
+//     console.log(i)
+// }
+
+function repeatLog(n){
+    for (let i = 0; i < n; i++){
+        console.log(i)
+    }
+}
+
+
+function repeat(n, action){
+    for (let i = 0; i < n; i++){
+        action(i);
+    }
+}
+
+let labels = [];
+repeat(5, i => {
+    labels.push(`Unit ${i + 1}`);
+})
+console.log(labels);
+
+function greaterThan(n){
+    return m => m > n;
+}
+let greaterThan10 = greaterThan(10);
+console.log(greaterThan10(9));
+
+function noisy(f) {
+    return (...args) => {
+        console.log("calling with", args);
+        let result = f(...args);
+        console.log("called with", args, ", returned", result);
+        return result;
+    };
+}
+noisy(Math.max)(3, 2, 1);
+
+function unless(test, then){
+    if(!test)then();
+}
+repeat(13, n => {
+    unless(n % 2 == 1, () => {
+        console.log(n, "is even");
+    });
+});
+["A", "B"].forEach(l => console.log(l));
+
+// Hashrocket - Arrow functions
+const square = x => x * x;
+console.log(square(4))
+const sum = (a,b) => {
+    return a + b
+}
+console.log(sum(2,4));
+
+function outerFunction(){
+    var outerVariable = "Hello, ";
+
+    function innerFunction(name){
+        var innerVariable = "World!";
+        var message = () => {
+            console.log(outerVariable + name + " " + innerVariable);
+        };
+        return message()
+    }
+    innerFunction("John");
+}
+outerFunction();
+
+const numbers = [1,2,3,4,5];
+const filteredNumbers = numbers.filter(number => number % 2 === 0);