jobbet litt med arrow functions

eloquentjavascript/05_higher_order_functions/summarizing_with_reduce.js

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+const SCRIPTS = require("./scripts.js");
+
+function reduce(array, combine, start) {
+    let current = start;
+    for(let element of array){
+        current = combine(current, element);
+    }
+    return current
+}
+console.log(reduce([1,2,3,4], (a,b) => a +b, 0));
+console.log([1,2,3,4].reduce((a,b) => a +b));
+
+function characterCount(script) {
+    return script.ranges.reduce((count, [from, to]) => {
+        return count + (to - from);
+    }, 0);
+}
+console.log(SCRIPTS.reduce((a,b) => {
+    return characterCount(a) < characterCount(b) ? b : a;
+}));

eloquentjavascript/05_higher_order_functions/transforming_with_map.js

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+const SCRIPTS = require("./scripts.js");
+
+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));