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const circle = { | |
radius: 1, | |
draw() { | |
console.log('draw'); | |
} | |
}; | |
for (let key in circle) { | |
console.log(key, circle[key]); | |
} |
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const circle = { | |
radius: 1, | |
draw() { | |
console.log('draw'); | |
} | |
}; | |
// ONE | |
const another = {}; |
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// Function Declaration | |
function walk() { | |
console.log('walk'); | |
} | |
// Named Function Expression | |
let run1 = function walk() { | |
console.log('run1'); | |
}; |
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function sum(discount, ...prices) { | |
const total = prices.reduce((a, b) => a + b); | |
return total * (1 - discount); | |
} | |
console.log(sum(0.1, 20, 30, 1)); |
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function interest(principal, rate, years) { | |
rate = rate || 3.5; | |
years = years || 5; | |
return (principal * rate) / 100 * (years) | |
} | |
console.log(interest(10000)); | |
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const person = { | |
firstName: 'Bolaji', | |
lastName: 'Ayodeji', | |
get fullName() { | |
return `${person.firstName} ${person.lastName}` | |
}, | |
set fullName(value) { | |
if(typeof value !== 'string') { | |
throw new Error('Value is not a string'); | |
} |
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// method (function inside an object) -> object | |
// function -> global (window, global) | |
const video = { | |
title: 'Bird Box', | |
tags: ['english', 'french', 'chineese'], | |
showTags() { | |
this.tags.forEach(tag => { | |
console.log(this.title, tag); | |
}); |
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function countOccurences(array, searchElement) { | |
if (!Array.isArray(array)) { | |
throw new Error('Enter a valid array'); | |
} | |
return array.reduce((accumulator, current) => { | |
const occurence = (current === searchElement) ? 1 : 0; | |
return accumulator + occurence; | |
}, 0) | |
} |
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// for... in loop | |
let start = performance.now(); | |
let obj = { | |
key1: "value1", | |
key2: "value2", | |
key3: "value3" | |
} | |
for (let key in obj) { | |
let value = obj[key]; | |
console.log(key, value); |
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let obj = { | |
key1: "value1", | |
key2: "value2", | |
key3: "value3" | |
} | |
for (let key in obj) { | |
let value = obj[key]; | |
console.log(key, value); | |
} | |
// key1 value1 |