the finalized functions

Roslyakov Evgeny/hw_js_funcs.js

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+// ---------- 1 ---------- //
+
+function splitAndMerge(str, sp) {
+    return str.split(' ')
+        .map(function(word) {
+            return word.split('')
+        })
+        .map(function(newWord) {
+            return newWord.join(sp)
+        })
+        .reduce(function(acc, cur) {
+            return acc + ' ' + cur + ' '
+        })
+        .trim();
+}
+
+// console.log(splitAndMerge("My name is John"," "));
+// console.log(splitAndMerge("Hello World!",","));
+
+
+// ---------- 2 ---------- //
+
+function convert(hash) {
+    var res = [];
+        temp = [];
+    for(key in hash) {
+        temp.push(key, hash[key]);
+        res.push(temp);
+        temp = [];
+    }
+
+    return res;
+}
+
+// console.log(convert({name: 'Jeremy', age: 24, role: 'Software Engineer'}));
+
+
+// ---------- 3 ---------- //
+
+function toCamelCase(str) {
+    return str.split('')
+        .reduce(function(acc, cur, i, arr) {
+            if(cur === '-' || cur === '_') {
+                arr[i+1] = arr[i+1].toUpperCase();
+                return acc;
+            }
+            return acc += cur;
+        })
+}
+
+// console.log(toCamelCase("the-stealth-warrior"));
+// console.log(toCamelCase("The_Stealth_Warrior"));
+
+
+// ---------- 4 ---------- //
+
+function reverse(str) {
+    var temp = str.split(' '),
+        res = '';
+    temp.forEach(function (word) {
+        var newWord = word.split('').reverse().join('');
+        res += newWord + ' ';
+    })
+    return res.concat();
+}
+
+// console.log(reverse(" A fun little challenge! "));
+
+
+// ---------- 5 ---------- //
+
+function stringExpansion(str) {
+    return str.split('')
+        .reduce(function(acc, cur, i, arr) {
+            if(Number.isInteger(+cur)) {
+                if(Number.isInteger(+arr[i+1])) {
+                    return acc;
+                }
+                return acc += new Array(+cur).join(arr[i+1]);
+            }
+            return acc += cur;
+        }, '')
+}
+
+// console.log(stringExpansion('3D2a5d2f'));
+// console.log(stringExpansion('3d332f2a'));
+// console.log(stringExpansion('abcde'));
+
+
+// ---------- 6 ---------- //
+
+function largest() {
+    return Math.max.apply(null, arguments);
+}
+
+function smallest() {
+    return Math.min.apply(null, arguments);
+}
+
+// console.log(largest(2, 0.1, -5, 100, 3));
+// console.log(smallest(2, 0.1, -5, 100, 3));
+
+
+// ---------- 7 ---------- //
+
+function transform(baseArray) {
+    return baseArray.map(function(elem, i, arr) {
+        elem = function() {
+            var idx = i;
+            var refArr = arr;
+            console.log(refArr[idx]);
+        };
+        return elem;
+    })
+}
+
+// var newArray = transform([10, 20, 30, 40, 50]);
+// newArray[3]();
+// newArray[4]();
+
+
+// ---------- 8 ---------- //
+
+function sum() {
+    if(arguments.length !== 1) {
+        return arguments[0] + sum.apply(null, [].slice.call(arguments, 1));
+    } else {
+        return arguments[0];
+    }
+}
+
+// console.log(sum(1,3,5,7));
+
+
+// ---------- 9 ---------- //
+
+function countDown(num) {
+    var newTimer = setInterval(function() {
+        if(num === 0) clearInterval(newTimer);
+        console.log(num);
+        num -= 1;
+    }, 1000);
+}
+
+// countDown(3);
+
+
+// ---------- 10 ---------- //
+
+Function.prototype.myBind = function() {
+    var self = this,
+        context = arguments[0],
+        currArgs = [].slice.call(arguments, 1);
+    return function() {
+        var args = [].slice.call(arguments),
+            newArgs = currArgs.concat(args);
+        return self.apply(context, newArgs);
+    }
+}
+
+function addPropToNumber(number) { return this.prop + number; };
+var bound = addPropToNumber.myBind({ prop: 9 });
+// console.log(bound(1))