Nikita Korzhavin js-1

Nikita_Korzhavin/js10myBind.js

@@ -0,0 +1,22 @@
+Function.prototype.myBind = function(context) {
+  var bindArgs = Array.prototype.slice.call(arguments, 1);
+  var emptyFunc = function() {};
+  var currentThis = this;
+  var boundFunction = function() {
+    return currentThis.apply(
+      this instanceof emptyFunc && context ? this : context,
+      bindArgs.concat(Array.prototype.slice.call(arguments)),
+    );
+  };
+  emptyFunc.prototype = currentThis.prototype;
+  boundFunction.prototype = new emptyFunc();
+  return boundFunction;
+};
+
+/*
+function addPropToNumber(number) {
+  return this.prop + number;
+}
+var bound = addPropToNumber.myBind({ prop: 9 });
+console.log(bound(1)); // 10
+*/

Nikita_Korzhavin/js1splitAndMerge.js

@@ -0,0 +1,13 @@
+function splitAndMerge(str, sp) {
+  return str
+    .split(' ')
+    .map(function(word) {
+      return word.split('').join(sp);
+    })
+    .join(' ');
+}
+
+/*
+console.log(splitAndMerge('My name is John', ' '));
+console.log(splitAndMerge('Hello World!', ','));
+*/

Nikita_Korzhavin/js2convert.js

@@ -0,0 +1,9 @@
+function convert(obj) {
+  return Object.keys(obj).map(function(key) {
+    return [key, obj[key]];
+  });
+}
+/*
+const guy = { name: 'Jeremy', age: 24, role: 'Software Engineer' };
+console.log(convert(guy));
+*/

Nikita_Korzhavin/js3ToCamelCase.js

@@ -0,0 +1,12 @@
+function toCamelCase(str) {
+  return str
+    .split(/-|_/)
+    .map(function(word, index) {
+      return index !== 0 ? word.charAt(0).toUpperCase() + word.slice(1) : word;
+    })
+    .join('');
+}
+/*
+console.log(toCamelCase('the-stealth-warrior'));
+console.log(toCamelCase('The_Stealth_Warrior'));
+*/

Nikita_Korzhavin/js4reverceString.js

@@ -0,0 +1,14 @@
+function reverseString(sentence) {
+  return sentence
+    .split(' ')
+    .map(function(word) {
+      return word
+        .split('')
+        .reverse()
+        .join('');
+    })
+    .join(' ');
+}
+/*
+console.log(reverseString(' A fun little challenge! ')); //" A nuf elttil !egnellahc "
+*/

Nikita_Korzhavin/js5stringExpansion.js

@@ -0,0 +1,22 @@
+function stringExpansion(str) {
+  if (str === '') {
+    return '';
+  }
+  return str
+    .match(/^[a-z]+|\d+\w|[^\d]+/gi)
+    .reduce(function(acc, curr) {
+      if (!parseInt(curr)) {
+        acc.push(curr);
+      } else {
+        acc.push(curr[curr.length - 1].repeat(parseInt(curr[curr.length - 2])));
+      }
+      return acc;
+    }, [])
+    .join('');
+}
+/*
+console.log(stringExpansion('3D2a5d2f')); // 'DDDaadddddff'
+console.log(stringExpansion('3d332f2a')); // 'dddffaa'
+console.log(stringExpansion('abcde')); // 'abcde'
+console.log(stringExpansion('ab2deee2ff'));
+*/

Nikita_Korzhavin/js6largestSmallest.js

@@ -0,0 +1,23 @@
+function largest() {
+  var nums = [];
+  for (var i = 0; i < arguments.length; i++) {
+    nums[i] = arguments[i];
+  }
+  return nums.reduce(function(acc, curr) {
+    return curr > acc ? curr : acc;
+  }, nums[0]);
+}
+
+function smallest() {
+  var nums = [];
+  for (var i = 0; i < arguments.length; i++) {
+    nums[i] = arguments[i];
+  }
+  return nums.reduce(function(acc, curr) {
+    return curr < acc ? curr : acc;
+  }, nums[0]);
+}
+/*
+console.log(largest(2, 0.1, -5, 100, 3)); // 100
+console.log(smallest(2, 0.1, -5, 100, 3)); // -5
+*/

Nikita_Korzhavin/js7transform.js

@@ -0,0 +1,14 @@
+function transform(arr) {
+  return arr.map(function(num) {
+    return function() {
+      return num;
+    };
+  });
+}
+/*
+const baseArray = [10, 20, 30, 40, 50];
+const newArray = transform(baseArray);
+
+console.log(newArray[3]());
+console.log(newArray[4]());
+*/

Nikita_Korzhavin/js8sum.js

@@ -0,0 +1,21 @@
+function sum() {
+  // превращаем arguments в нечто удобоваримое
+  var nums = [];
+
+  for (var i = 0; i < arguments.length; i++) {
+    nums[i] = arguments[i];
+  }
+
+  var numsFlat = nums.reduce(function(acc, curr) {
+    return acc.concat(curr);
+  }, []);
+  // сама рекурсия
+  if (numsFlat.length === 1) {
+    return numsFlat[0];
+  }
+
+  return numsFlat[0] + sum(numsFlat.slice(1));
+}
+/*
+console.log(sum(1, 3, 5, 7)); //should return 16
+*/

Nikita_Korzhavin/js9countDown.js

@@ -0,0 +1,12 @@
+function countDown(num) {
+  function time(i) {
+    setTimeout(function() {
+      console.log(i);
+    }, 1000 * (num - i));
+  }
+  for (var i = num; i >= 0; i--) {
+    time.bind(null)(i);
+  }
+}
+
+countDown(3); // 3 2 1 0