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Javascript Control Flow
Equality
- Triple Equals
1 === 1;Checks type and value
1 == 1;checks only values
0 == "0" // true 0 == "" // true 0 == [] // truehowever,
0 == null // false 0 == undefined // falseand,
"true" == true // false "false" == false // falseIf you want to check:
5 == "5";better do:
5 === Number("5");
"" // falsy [] // truthy () // truthy NaN // falsy Infinity // falsy 0 // falsymore confusing shizer:
"" == false // true 0 == false // true 0n == false // true Nan == false // false null == false // false undefined == false // false
memorize the 7 falsy values
- ""
- 0
- 0n
- NaN
- undefined
- null
- false
null == null // true null == false // false null == true // false
Obj1 === obj2 // always falseunless they are literally the same object. }
If Statements
let condition = true; let condition2 = false; if (condition) { console.log("Do action"); } else if (condition2) { console.log("take alternative actions"); } else { console.log("take default action"); }
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