kepta

const isRequired = () => { throw new Error('param is required'); };

function filterEvil(array, evil = isRequired()) {
  return array.filter(item => item !== evil);   
}

kepta

function firstItem([first, second] = ['luke', 'skywalker']) {
  return first;
}

function findName({ name } = { name : 'darth' }) {
  return name;
}

kepta

In this article I will take a very simplistic approach in understanding memory leaks and I will also attempt to diagnose them.

In todays world of abundant memory, we seldom worry about memory leakages. But I hate to tell you that we live in a real world and nothing comes for free.

Oh my fancy functional programming

Disclosure: I absolutely love functional programming. Functional programming is cool and with the new ES6 syntax it becomes even cooler.

kepta

const arrayAddFirst = (a, b) => [a, ...b];

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result = newData.reduce((p,r) => arrayAddFirst(r, p), []);

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for(var i = 0; i < newData.length; i++) { 
  for(var j = 0; j < i; j++) { 
    // stuff here 
  } 
}

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var x = 0; 
while(x < 5) { 
  console.log(x); // Warning! do not try this at home  
}

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var x = [ [1] ]; 
for(var i = 1; i < 100000; i++) { 
  x.push(arrayAddFirst(i, x[i-1])); // Warning! do not try this at home  
}

kepta

function sayHi() { 
  var allNames = []; 
  var emoji = '👋'; 
  return name => { 
    allNames.push(name); 
    return emoji + name; 
  } 
}

kepta

function sayHi() { 
  var allNames = []; 
  var emoji = '👋'; 
  return name => { 
    allNames.push(name); 
    return emoji + name; 
  } 
}