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article = nilarticle.nil? # => trueempty?Checks if an element-like a string or an array f.e.-Is empty:# Array[].empty? #=> true# String"".empty? #=> trueRails adds the method to the blank? Object class: An object is blank if it ' s

In Ruby, you check with nil? if an object is nil:article = nilarticle.nil? # => true empty?Checks if an element-like a string or an array F. E.-Is empty: # Array[].empty? #=> true# String"".empty? #=> true Rails adds the

In Ruby, you checknil?If an object is nil: article = nilarticle.nil? # => true empty?Checks if an element-like a string or an array F. E.-Is empty: # Array[].empty? #=> true# String"".empty? #=> true Rails adds the Methodblank?ToObjectClass:

There are many blank lines after extracting the log files to be viewed recently, which is not conducive to the comparison of previous files. for backward compatibility, this article describes how to use shell to remove empty rows in a file. learn

The reason for the php blank page in the php Tutorial and the solution are as follows. Php blank pages in the php Tutorial: causes and solutions; reasons for blank pages in php and solutions. many programmers have encountered the reason and solution

. Nil? ,. Empty?,. Blank?. Present? The differenceFirst of all, these three are empty. and. Nil? And. Empty? Is the Ruby method: blank? It's the rails approach.. Nil? Determines whether an object exists (nil). Non-existent objects are nil.. Empty?

HTML blank line method-html article segment dashed line interval empty rowHTML blank line method, in the HTML article paragraph body sense music sofa empty line interval Implementation There are several ways?Empty line IntervalHTML page Empty line

There are many ways to delete empty rows and columns in exce, it is relatively simple to delete empty rows, just filter, filter out blank lines, Delete them, But it is difficult to delete empty Columns. Because you cannot filter by column to Delete.

Sky = nilsky. nil? #=> TrueAll other objects are object. nil? All are false. If a database attribute is null, the attribute is. nil? #=> TrueEmpty? Used for string, array, and hash# Array []. Empty? #=> True # string "". Empty? #=> TrueBut "". Empty?

PHP Tutorial PHP Blank page reasons and solutions, PHP blank page A summary of the causes and workarounds for blank pages in PHP. Many programmers in the development of PHP have encountered the appearance of blank pages, comprehensive analysis, in