DEV Community: Pratik Lochawala

Remove continues element from an array

Pratik Lochawala — Sun, 27 Jun 2021 05:10:25 +0000

let's first understand what continuous element

in the above example, you have seen there is a repeating
now I want to remove all continuous value only (not duplication) and keep 1st element of each repeating value

let's see how can we achieve that

we can achieve that using array filter method

Javascript filter accept callback function and that callback function accept 3 arguments

element: it's return an current element
index(optional): it's return index current element
array(optional): it's return actual array on which filter is perform

so in above code we first check if element index is 0 or current element is not match with previous element then we return that element

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Cool math function shorthand

Pratik Lochawala — Sun, 20 Jun 2021 06:01:15 +0000

pow

** exponentiation operator raising the first operand to the power of the second

more details explanation click here

floor

~~ double bitwise not operator rounding a number towards zero

more details explanation click here

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Most common javascript string function

Pratik Lochawala — Sun, 13 Jun 2021 07:22:00 +0000

charAt

charAt method returns the character at the specified index in a string

charCodeAt

charCodeAt method returns Unicode of the character at the specified index in a string

substr

substr extracts the characters from a string, beginning at a specified start position, and through the specified number of character

substring

substring Extracts the characters from a string, between two specified indices

toLowerCase

toLowerCase converts a string to lowercase letters

toUpperCase

toUpperCase converts a string to uppercase letters

trim

trim remove white space from start and end of string

repeat

repeat returns a new string with a specified number of copies of an existing string

startsWith

startsWith method is used to check whether a string starts with a specific word or not. it returns true or false

endsWith

endsWith is used to check whether a string ends with a specific word or not. it returns true or false

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Javascript most useful array functions

Pratik Lochawala — Sun, 06 Jun 2021 05:22:34 +0000

push

push method adds one or more element at the end of an array

pop

pop is removed the last element of the array & return that element

shift

A shift method removes the first element from the array and all other element indexes decrease by 1

unshift

unshift method adds a new element at the beginning of an array and all other element indexes increase by 1

concat

concat method concat two or more array and return a new array

reverse

reverse method reverses and returns the array

slice

A slice method return portion of an array as a new array without touching the existing array it's accepted 2 optional arguments start index & end index

splice

splice method uses to add or remove an element from an array. It's accepted 3 argument start index, delete count & new elements, it's return deleted elements.

find

find method return a 1st element that match with given test

filter

filter method returns an element that matches with given test

some

*some method returns true or false if one of the array element is pass in test condition *

every

every method checks whether all elements in an array pass the applied test and return true if pass else false

map

map method creates a new array with result to apply given function to each element

sort

sort method short array in alphabetical order. it's sort array values as strings

More sorting example

reduce

reduce method reduces the array to a single value from left to right

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Most useful javascript math functions

Pratik Lochawala — Sun, 30 May 2021 04:45:26 +0000

abs

Math.abs function returns the absolute value of a number

ceil

Math.ceil function rounds a number up to the next largest integer

floor

Math.floor function rounds a number down to its nearest integer

round

Math.round function rounds a number to its nearest integer

trunc

Math.trunc function returns the integer part of a number

max

Math.max function returns the number with the largest value

min

Math.min function returns the number with the lowest value

pow

Math.pow function returns the base to the exponent power

sqrt

Math.sqrt function returns the square root of a number

cbrt

Math.cbrt function returns the cubic root of a number

random

Math.random return random number between 0 to 1

Bonus

sign

Math.sign return an argument is negative, positive or NaN

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