Arrays Example

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Type inference FTW.

let strings = ["a", "b", "c"];

let strings2: string[] = ["d", "e", "f"];

let strings3: string[] = [];

let strings4: string[] = new Array(3).fill("hey");

Appending.

strings.push("d", "e");
strings.push("f", "g");

Joining.

strings3 = [...strings, ...strings2];

Checking length.

console.log(strings.length);

Accessing elements.

console.log(strings[0]);
console.log(strings[strings.length - 1]);

Assigning elements.

strings[0] = "a";

Slices.

strings.splice(0, 1, "a");
strings.splice(0, 2, "a", "b");
strings.slice(0, 4);
strings.slice(0, strings.length);

Methods.

if (strings.length === 0) {
  console.log("empty");
} else {
  console.log("populated");
}
strings.splice(0, 0, "a");
console.log(strings.shift());
strings = strings.map(str => str + "0");
strings.pop();

Clearing.

strings.length = 0;
strings = [];

Using a loop to create a multidimensional array.

let rows = 10, cols = 10;
let dimensional: number[][] = [];
for (let col = 0; col < 10; col++) {
  dimensional.push(new Array(rows).fill(0));
}