From ff6e413e0ff41ff1f93d854734630e4295ea7fb8 Mon Sep 17 00:00:00 2001 From: pedro Date: Sat, 22 Oct 2022 13:06:07 -0300 Subject: [PATCH] feat(javascript): add a string cheatsheets --- languages/javascript.js | 45 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) diff --git a/languages/javascript.js b/languages/javascript.js index 2fc57ba..cd44e46 100644 --- a/languages/javascript.js +++ b/languages/javascript.js @@ -95,3 +95,48 @@ arr.reduce(callback[, initialValue]) // Apply a function against arr.reduceRight(callback[, initialValue]) // Apply a function against an accumulator and each value of the array (from right-to-left) as to reduce it to a single value. arr.some(callback[, initialValue]) // Returns true if at least one element in this array satisfies the provided testing function. arr.values() // Returns a new Array Iterator object that contains the values for each index in the array. + +/* ******************************************************************************************* + * GLOBAL OBJECTS > STRING + * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String + * ******************************************************************************************* */ + +// Global object: properties +str.length // Returns the number of characters in string + +// Methods of the Object constructor +String.fromCharCode(num1[, ...[, numN]]) // Returns a string created from the specified sequence of UTF-16 code units. +String.fromCodePoint(num1[, ...[, numN]]) // Returns a string created by using the specified sequence of code points +String.raw(strings, ...substitutions) // It's used to get the raw string form of template literals that is, substitutions (e.g. ${foo}) are processed, but escape sequences (e.g. \n) are not. + +// Methods +str.charAt(index) // Takes an integer and return the character in position passed, if not found returns an empty string +str.charCodeAt(index) // Takes an integer that corresponds to a position in the string and returns Unicode of the character at that position +str.codePointAt(index) // Takes an integer and returns the Unicode of the position passed as an argument +str.concat(string2[, ...stringN]) // Receives an N number of strings and returns their concatenation +str.endsWith(searchString[, endPosition]) // Checks if the string ends with one or more characters, returning a boolean +str.includes(searchString[, position]) // Checks if the characters passed as an argument are present in the string +str.indexOf(searchValue[, fromIndex]) // Returns the index of the first occurrence of the value provided as an argument in the searchValue +str.lastIndexOf(searchValue[, fromIndex]) // Returns the index of the last occurrence of the value provided as an argument in the searchValue +str.localeCompare(compareString[,locales[,options]]) // Checks if the reference string comes before or after the one passed as an argument +str.match(regexp) // Retrieves the result of matching a string against a regular expression. +str.matchAll(regexp) // Returns an iterator of all results matching a string against a regular expression, including capturing groups +str.normalize([form]) // Returns the Unicode Normalization Form of the string +str.padEnd(targetLength [, padString]) // Returns a new string padded from the right end with the character or group of characters specified in padString +str.padStart(targetLength [, padString]) // Returns a new string padded from the beginning with the character or group of characters specified in padString +str.repeat(count) // Constructs and returns a new string which contains the specified number of copies of the string on which it was called, concatenated together +str.replace(regexp|substr, newSubStr|func) // Takes as first argument a string or a Regex that the match or matches are replaced, the second argument is a new string or a function that the return will replace the occurrences, and returns a new string with the replacements +str.replaceAll(regexp|substr, newSubStr|func) // It takes as the first argument a string or a Regex that matches will be replaced, the second argument is a new string or a function that the return will replace the occurrences, and returns a new string with the replacements +str.search(regexp) // It takes a regexp as an argument and returns the index of the position that satisfies it +str.slice(start, end) // Remove a part of the string and return a new string +str.split([separator[, limit]]) // Splits the string from a separator defined in the first argument and returns an array of strings +str.startsWith(searchString[, position]) // Checks if the string starts with one or more characters, returning a boolean +str.toLocaleLowerCase(locale) // Converts all letters to lowercase and return the string with the converted values according to the locale specified as an argument +str.toLocaleUpperCase(locale) // Converte todas as letras em valores retorna uma string com os valores de acordo com a localidade especificada como argumento +str.toLowerCase() // Convert all letters to lowercase and return the string with the converted values +str.toString() // Returns a string representing the specified string value. +str.toUpperCase() // Converts all letters to uppercase returns the string with the converted values +str.trim() // Remove whitespace at the beginning and end of the string +str.trimStart() // Remove whitespace at the beginning +str.trimEnd() // Remove whitespace at the end of the string +str.valueOf() // Returns the primitive value of a String object.