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Darya Kozlova/hw_3_functions.js

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+// function 1
+function splitAndMerge_1(s, sep) {
+    var ans = "";
+    let arr = s.split(" ");
+    for (i = 0; i < arr.length; i++) {
+        let tmp = arr[i].split('');
+        for (j = 0; j < tmp.length; j++) {
+            ans = ans.concat(tmp[j]);
+            if (j < tmp.length - 1) {
+                ans = ans.concat(sep);
+            }
+        }
+        if (i < arr.length - 1) {
+            ans = ans.concat(' ');
+        }
+    }
+    return ans;
+}
+
+function splitAndMerge_2(s, sep) {
+    return s.split(" ").reduce(function(acc, currItem, i, a) {
+        tmp = [...currItem].reduce(function(acc, currItem, i, a) {
+            acc = acc.concat(currItem)
+            if (i != a.length - 1) {
+                acc = acc.concat(sep)
+            }
+            return acc;
+        }, "")
+
+        acc = acc.concat(tmp);
+        if (i != a.length - 1) {
+            acc = acc.concat(" ");
+        }
+        return acc;
+    }, "");
+}
+
+function splitAndMerge_3(s, sep) {
+    return s.split(" ").map(function(curr) {
+        return [...curr].join(sep);
+    }).join(" ");
+}
+//_____________________________________________________________________________________________________________________________
+//function 2
+
+function convert(d) {
+    var a = []
+    for (i in d) {
+        a.push([i, d[i]])
+    }
+    return a;
+}
+
+//_____________________________________________________________________________________________________________________________
+//fucntion 3
+
+function toCamelCase(s) {
+    var ans = "";
+    var up = 0;
+    for (i = 0; i < s.length; i++) {
+        if ((s.charAt(i) == '-') || (s[i] == '_')) {
+            up = 1;
+        } else {
+            if (up == 0) {
+                ans = ans.concat(s.charAt(i));
+            } else {
+                ans = ans.concat(s.charAt(i).toUpperCase());
+            }
+            up = 0;
+        }
+    }
+    return ans;
+}
+
+function toCamelCase(s) {
+    return s.replace(/-/g, '_').split("_").map(function(cur, i) {
+        if (i != 0) {
+            return cur.charAt(0).toUpperCase() + cur.substring(1);
+        } else {
+            return cur;
+        }
+    }).join("");
+}
+
+//fucntion 4
+
+function reverse_word(s) {
+    return s.split(' ').map(function(cur) { return cur.split("").reverse().join("") }).join(" ");
+}
+
+//______________________________________________________________________________________________________________________________
+//fucntion 5
+
+function stringExpansion(s) {
+    var ans = "";
+    var t = 1;
+    for (i = 0; i < s.length; i++) {
+        if (s.charCodeAt(i) >= '0'.charCodeAt(0) && s.charCodeAt(i) <= '9'.charCodeAt(0)) {
+            t = s.charCodeAt(i) - '0'.charCodeAt(0);
+        } else {
+            for (j = 0; j < t; j++) {
+                ans = ans.concat(s.charAt(i))
+            }
+            t = 1;
+        }
+    }
+    return ans;
+}
+
+
+function stringExpansion(s) {
+    var ans = "",
+        t = 1;
+    for (i = 0; i < s.length; i++) {
+        if (/\d/.test(s.charAt(i))) {
+            t = parseInt(s.charAt(i));
+        } else {
+            ans = ans.concat(s.charAt(i).repeat(t))
+            t = 1;
+        }
+    }
+    return ans;
+}
+
+//______________________________________________________________________________________________________________________________
+//fucntion 6
+function largest() {
+    var ans = arguments[0]
+    for (i = 0; i < arguments.length; i++) {
+        if (arguments[i] > ans) { // <
+            ans = arguments[i]
+        }
+    }
+    return ans;
+}
+
+function smallest(...args) {
+    function compareNumeric(a, b) {
+        if (a > b) return 1;
+        if (a < b) return -1;
+    }
+    return args.sort(compareNumeric)[0]; // args.length - 1
+}
+
+//_____________________________________________________________________________________________________________________________
+//fucntion 7
+
+function transform(a) {
+    return a.map(function(cur) {
+        return function() { return cur }
+    })
+}
+
+//______________________________________________________________________________________________________________________________
+//fucntion 8
+
+function sum(...args) {
+    if (args.length == 1) {
+        return args[0]
+    } else {
+        return args[0] + sum.apply(null, args.slice(1))
+    }
+}
+
+//______________________________________________________________________________________________________________________________
+//fucntion 9
+
+function countDown(n) {
+    var t = n;
+    for (i = 0; i <= n; i++) {
+        setTimeout(function() { console.log(t--) }, i * 1000)
+    }
+}
+
+//______________________________________________________________________________________________________________________________
+//fucntion 10