Stuff you may not know about console

Posted on October 20, 2015  •  1 minutes  • 119 words

console.table()

var Person = function(name, age) {
    this.name = name
    this.age = age
}

var person_list = [
    new Person('wayne', 10),
    new Person('cristiano', 20),
    new Person('david', 30),
    new Person('bastian', 40)
]

console.table(person_list, ['name', 'age']) // filtering columns
console.table(person_list)

You’ll get a nice table like this

console.time()

console.time('Operation A')
var arr = []
for (var i =0; i < 100000; ++i) {
    arr.push(i)
}
console.timeEnd('Operation A')

> Operation A: 395.557ms

console.assert()

for (var i = 0; i < 100000; ++i) {
    console.assert(i % 1000, 'Iteration #%d', i)
}

This will only print when first arg (i % 1000) is false.

console.group()

Group so that you can collapse/expand messages within a group.

console.group('Group A')
console.log('First line')
console.log('Second line')
console.log('Third line')
console.groupEnd()