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| 1 | +**Table of Content** |
| 2 | + |
| 3 | +- [Functions](#functions) |
| 4 | + - [Function Declarations and Function Expression](#function-declarations-and-function-expression) |
| 5 | + - [Difference between function declaration and function expression](#difference-between-function-declaration-and-function-expression) |
| 6 | + - [Function Parameters](#function-parameters) |
| 7 | + - [Default Parameter](#default-parameter) |
| 8 | + - [Rest Parameter](#rest-parameter) |
| 9 | + - [Difference Between Arguments and Rest Parameter](#difference-between-arguments-and-rest-parameter) |
| 10 | + - [Arrow Functions](#arrow-functions) |
| 11 | + - [Function Scope](#function-scope) |
| 12 | + - [Lecxical Scoping](#lecxical-scoping) |
| 13 | + - [Closures](#closures) |
| 14 | + - [IIFEs](#iifes) |
| 15 | + - [Recursion](#recursion) |
| 16 | + - [JavaScript Built-In Functions](#javascript-built-in-functions) |
| 17 | + - [Number Methods](#number-methods) |
| 18 | + - [Boolean Methods](#boolean-methods) |
| 19 | + - [String Object](#string-object) |
| 20 | + - [Array Methods](#array-methods) |
| 21 | + |
1 | 22 | # Functions |
2 | 23 |
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3 | 24 | A `function` is a block of code that runs when the function is called. |
@@ -358,3 +379,34 @@ function power(a, n) { |
358 | 379 | - `toFixed()`: formats a number with a specific number of digits to the right of decimal. |
359 | 380 | - `toString()`: returns the string representation of the number's value |
360 | 381 | - `valueOf()`: returns the number's value |
| 382 | + |
| 383 | +### Boolean Methods |
| 384 | + |
| 385 | +- `toSource()`: returns a string containing the source of the Boolean object |
| 386 | +- `toString()`: returns a string of either `true` or `false` depending upon the value of object |
| 387 | +- `valueOf()`: returns the primitive value of a Boolean object |
| 388 | + |
| 389 | +### String Object |
| 390 | + |
| 391 | +- `charAt()`: returns the character at specified index |
| 392 | +- `concat()`: combines the text of two strings and returns a new string |
| 393 | +- `indexOf()`: returns the index of first occurence of specified value within an array of string (`-1` if not found) |
| 394 | +- `lastIndexOf()`: returns the index of last occurence od specified calue within an array of string (`-1` if not found) |
| 395 | +- `length()`: returns the length of string |
| 396 | +- `match()`: used to match regular expression against a string |
| 397 | +- `replace()`: used to find a match between regular expression and a string, and replace the matched substring with a new substring |
| 398 | +- `slice()`: splits a string object into array of string by seperating the string into substrings |
| 399 | + |
| 400 | +### Array Methods |
| 401 | + |
| 402 | +- `concat()`: returns a new array compromised of the array joined with other array(s) |
| 403 | +- `every()`: returns `true` if every element in this array satisfies the provided testing fucntion |
| 404 | +- `filter()`: creates a new array with all elements of this array for which the provided filtering function returns `true` |
| 405 | +- `indexOf()`: returns the first index of an element within the array equal to specified value (`-1` if not found) |
| 406 | +- `join()`: joins all the elements of an array into string |
| 407 | +- `pop()`: removes and returns the last element from an array |
| 408 | +- `push()`: adds one or more elements to the end of an array and returns the new length of the array |
| 409 | +- `shift()`: removes and returns the first element of the array |
| 410 | +- `unshift()`: adds one or more elements to the front of array and returns the new length of array |
| 411 | +- `slice()`: extracts a section of array and returns a new array |
| 412 | +- `splice()`: add, remove or replace elements in an array based on their index |
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