Taschenspieler-Tricks
für Programmierer
Teil 1
Funktionale Array-Verarbeitung
Arrays
var names = ['Peter', 'Jan', 'Markus'];
Processing Arrays
var names = ['Peter', 'Jan', 'Markus'];
var upperNames = [];
for (var i = 0; i < names.length; i++) {
upperNames.push( names[i].toUpperCase() );
}
console.log(upperNames);
Processing Arrays
var names = ['Peter', 'Jan', 'Markus'];
var upperNames = [];
for (var i = 0; i < names.length; i++) {
upperNames.push( names[i].toUpperCase() );
}
console.log(upperNames);
var names = ['Peter', 'Jan', 'Markus'];
var upperNames = names.map(function(name) {
return name.toUpperCase();
});
console.log(upperNames);
Processing Arrays
var names = ['Peter', 'Jan', 'Markus'];
var upperNames = [];
for (var i = 0; i < names.length; i++) {
if(names[i].length <= 3)
continue;
upperNames.push( names[i].toUpperCase() );
}
console.log(upperNames);
Processing Arrays
var names = ['Peter', 'Jan', 'Markus'];
var upperNames = [];
for (var i = 0; i < names.length; i++) {
if(names[i].length <= 3)
continue;
upperNames.push( names[i].toUpperCase() );
}
console.log(upperNames);
var names = ['Peter', 'Jan', 'Markus'];
var upperNames = names.filter(function(name) {
return name.length > 3;
}).map(function(name) {
return name.toUpperCase();
});
console.log(upperNames);
Processing Arrays
var names = ['Peter', 'jan', 'Markus'];
var allUppercase = (names.length > 0);
for (var i = 0; i < names.length; i++) {
if(names[i][0] != names[i][0].toUpperCase())
allUppercase = false;
}
console.log(allUppercase);
Processing Arrays
var names = ['Peter', 'jan', 'Markus'];
var allUppercase = (names.length > 0);
for (var i = 0; i < names.length; i++) {
if(names[i][0] != names[i][0].toUpperCase())
allUppercase = false;
}
console.log(allUppercase);
var names = ['Peter', 'jan', 'Markus'];
var allUppercase = names.every(function(name) {
return name[0] == name[0].toUpperCase();
});
console.log(allUppercase);
Processing Arrays
var names = ['Peter', 'jan', 'Markus'];
var someUppercase = false;
for (var i = 0; i < names.length; i++) {
if(names[i][0] == names[i][0].toUpperCase())
someUppercase = true;
}
console.log(allUppercase);
Processing Arrays
var names = ['Peter', 'jan', 'Markus'];
var someUppercase = false;
for (var i = 0; i < names.length; i++) {
if(names[i][0] == names[i][0].toUpperCase())
someUppercase = true;
}
console.log(allUppercase);
var names = ['Peter', 'jan', 'Markus'];
var someUppercase = names.some(function(name) {
return name[0] == name[0].toUpperCase();
});
console.log(someUppercase);
Javascript
Für alle !IE8
Polyfill für IE8:
https://libs.personalwerk.de/polyfills/polyfills.array.js
Processing jQuery Results
var $ul = ('ul.lala');
var $topLi = $ul.find('li').filter(function() {
return $(this).offset().top >= scrollTop + header
}).first();
console.log($topLi);
Processing Arrays in PHP
$names = ['Peter', 'Jan', 'Markus'];
$upperNames = array_map(function($name) {
return strtoupper($name);
}, $names);
print_r($upperNames);
Processing Arrays in PHP
$names = ['Peter', 'Jan', 'Markus'];
$filteredNames = array_filter($names, function($name) {
return strlen($name) <= 3;
});
$upperNames = array_map(function($name) {
return strtoupper($name);
}, $filteredNames);
print_r($upperNames);
Processing Arrays in PHP
$names = ['Peter', 'Jan', 'Markus'];
$filteredNames = array_filter($names, function($name) {
return strlen($name) <= 3;
});
$upperNames = array_map(function($name) {
return strtoupper($name);
}, $filteredNames);
print_r($upperNames);
Parameter-Reihenfolge bei Map und Filter ist unterschiedlich. Meeeh…
Taschenspieler-Tricks für Programmierer #1
By mazdermind
Taschenspieler-Tricks für Programmierer #1
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