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November 9, 2016 12:40
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Map and Filter in ES6
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var numbers = [1, 2, 3, -1, -2, -3]; | |
var newMapNumbers = numbers.map((number) => { | |
if(number > 0){ | |
number = number * 10 | |
} | |
return number | |
}) | |
var newFilterNumbers = numbers.filter((number) => { | |
if(number > 0){ | |
return number; | |
} | |
}) | |
console.log('Map values', newMapNumbers) | |
console.log('Filter values', newFilterNumbers) |
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function map(objList){ | |
var newArr = []; | |
objList.foreach(function(obj){ | |
if(obj.id == 1){ | |
obj.job = 'New job'; | |
} | |
newArr.push(obj); | |
}) | |
return newArr; | |
} | |
function filter(objList){ | |
var newArr = []; | |
objList.foreach(function(obj){ | |
if(obj.id == 1){ | |
obj.job = 'New job'; | |
newArr.push(obj); | |
} | |
}) | |
return newArr; | |
} | |
var newValues = map(todos); | |
var todos = [ | |
{ | |
id: 1, | |
job: 'Get up', | |
completed: true | |
}, | |
{ | |
id: 2, | |
job: 'Go to work', | |
completed: true | |
}, | |
{ | |
id: 3, | |
job: 'Have lunch', | |
completed: false | |
}, | |
{ | |
id: 4, | |
job: 'Go back to home', | |
completed: false | |
} | |
]; |
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