[JS Practice] Adjacent pairs in a string

Title :

Adjacent pairs in a string

Description:

Supplied with a single string, return the number of all adjacent pairs in that string.

The words within the string are separated by whitespace.

The function should be case-insensitive (i.e., the input string “orange OrAnGe” is a match).


Some example input/output:


//returns 0
countAdjacentPairs('') 

// returns 1
countAdjacentPairs('cat dog dog') 

// returns 1 (The first pair has been matched, and will be ignored from then on).
countAdjacentPairs('dog dog dog') 

// returns 2
countAdjacentPairs('cat cat dog dog cat')

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[JS Practice] Anagram Detection

Title :

Anagram Detection

Description:

According to wikipedia :

An anagram is a type of word play, the result of rearranging the letters of a word or phrase to produce a new word or phrase, using all the original letters exactly once; for example Doctor Who can be rearranged into Torchwood.

An anagram is the result of rearranging the letters of a word to produce a new word. (Ref wikipedia).

Note: anagrams are case insensitive

Examples

  • foefet is an anagram of toffee
  • Buckethead is an anagram of DeathCubeK

The challenge is to write the function isAnagram to return true if the word test is an anagram of the word original and false otherwise.

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[JS Practice] Filter invalid login

Title :

Filter invalid login

Description:

While developing a website, you detect that some of the members have troubles logging in. Searching through the code you find that all logins ending with a “_” make problems. So you want to write a function that takes an array of pairs of login-names and e-mails, and outputs an array of all login-name, e-mails-pairs from the login-names that end with “_”.

If you have the input-array:

[ [ "foo", "foo@foo.com" ], [ "bar_", "bar@bar.com" ] ]

it should output

[ [ "bar_", "bar@bar.com" ] ]

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[JS Practice] Valid The Coupon Code

Title :

Valid The Coupon Code

Description:

Your online store likes to give out coupons for special occasions. Some customers try to cheat the system by entering invalid codes or using expired coupons.

Your mission:
Write a function called checkCoupon to verify that a coupon is valid and not expired. If the coupon is good, return true. Otherwise, return false.

A coupon expires at the END of the expiration date. All dates will be passed in as strings in this format: “June 15, 2014”

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[JS Practice] Find majuscule letters

Title :

Find majuscule letters

Description:

Instructions

Write a function capitals that takes a single string (word) as argument. The functions must return an ordered list containing the indexes of all capital letters in the string.

Example

Test.assertSimilar( capitals('CodEWaRs'), [0,3,4,6] );

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[JS Practice] Sort characters

Title :

Sort characters

Description:

Write a function called sortGiftCode (sort_gift_code in Ruby) that accepts a string containing up to 26 unique alphabetical characters, and returns a string containing the same characters in alphabetical order.

Examples:

sortGiftCode( 'abcdef' );//=> returns 'abcdef'
sortGiftCode( 'pqksuvy' );//=> returns 'kpqsuvy'
sortGiftCode( 'zyxwvutsrqponmlkjihgfedcba' );
//=> returns 'abcdefghijklmnopqrstuvwxyz'

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[JS practice] javascript prototype Trim a String(重写trim方法)

Title :
Trim a String(重写javascript中的trim方法)

Description :
Extend the String prototype by a trim function, that returns the string with leading or trailing whitespaces removed.

重写javascript中的trim方法,使它可以消除一个字符串左右两边的空格(字符串中间的空格不用被消除)。

PS: Of course, the original trim function was removed before 😉

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