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JavaScript 27

[Javascript] JavaScript/Object/Array.join()/Concatenate array elements into one value

#javascript #JavaScript/Object/Array.join()/Concatenate array elements into one value .join() .join() concatenates the elements of an array into a single value. grammar var jbStr1 = jbAry.join(); Makes the elements of the jbAry array one value. Separate elements with a comma (,). To separate elements with a different character, put the desired character inside the (). var jbStr2 = jbAry.join( ' ..

Javascript 2022.08.27

[Javascript] JavaScript / Object / Array.indexOf(), Array.lastIndexOf() - methods that return the position (index) of the matching element

#javascript #JavaScript / Object / Array.indexOf(), Array.lastIndexOf() - methods that return the position (index) of the matching element .indexOf() .indexOf() is a method that returns the index of the element that matches the given value. Grammar array. indexOf( value, start ) value: Enter the value to search for. start : The index value to start searching. Optional, if omitted the value is 0...

Javascript 2022.08.26

[Javascript] JavaScript/Object/Array.every()/Method to check if every element meets a condition

#Javascript #JavaScript/Object/Array.every()/Method to check if every element meets a condition .every() .every() is a method that checks whether all elements in an array meet a condition. Returns true if all elements satisfy the condition, false otherwise. example Check the elements of the array in ascending order, stop checking if any element does not satisfy the condition, and return false. R..

Javascript 2022.08.25

[Javascript] JavaScript / Object / Array.concat() / Add elements or arrays to an existing array to create a new array

#Javascript #JavaScript / Object / Array.concat() / Add elements or arrays to an existing array to create a new array .concat() You can use the .concat() property to add elements or arrays to an existing array to create a new array. grammar var jbAry2 = jbAry1.concat( 'abc' ); Add the string abc to the jbAry1 array to create the jbAry2 array. var jbAry3 = jbAry1.concat( jbAry2 ); Sum two arrays ..

Javascript 2022.08.24

[Javascript] JavaScript/Object/Array.length/Property that returns the length of the array

#Javascript #JavaScript/Object/Array.length/Property that returns the length of the array .length .length is an attribute that returns the length of the array. Returns a number one greater than the index value of the last element. It has a different meaning than the number of elements belonging to the array. grammar array.length example The index value of the last element of array jbAry1 is 3, s..

Javascript 2022.08.23

[JavaScript] JavaScript / Event / onsubmit / Event that causes a task to run before submitting the form

#JavaScript #JavaScript / Event / onsubmit / Event that causes a task to run before submitting the form JavaScript's onsubmit event allows you to do something before submitting the form values. Let's see how it works with a simple example. Example 1 Create a simple membership registration page. The transfer button is created with an input tag. Click Register and it will take you to ok.html. Regi..

Javascript 2022.08.10

[JavaScript] JavaScript / Functions / String() / Function to convert number to string

#JavaScript #JavaScript / Functions / String() / Function to convert number to string String() String() is a function that converts a number to a string. Grammar String( object ) object : Enter a number or a variable whose value is a number. example The value of variable c is 3, which is the addition of number 1 and number 2. The value of variable d is 12, which is character 1 plus character 2. ..

Javascript 2022.08.10

[Javascript] JavaScript / Functions / parseFloat(), parseInt() - functions to replace strings with numbers

#javascript #JavaScript / Functions / parseFloat(), parseInt() - functions to replace strings with numbers parseFloat() parseFloat() is a function that incorrectly replaces strings. Grammar parseFloat( string ) If you start with a number, it incorrectly replaces that number. If there are multiple numbers in the relief, replace only the first number. Spaces are ignored if they start with a space...

Javascript 2022.08.08
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