Javascript Utility Functions

array_chunk.js

function chunk(arr, size) {
    if(!Array.isArray(arr)) {
        throw new TypeError("Input is not an array");
    }
    size = size || 1; //default size
    if(size > arr.length) {
        return arr;
    } else {
        var i = 0;
        var j = size;
        var chunkedArray = [];
        while( i < arr.length) {
            chunkedArray.push(arr.slice(i,j));
             i = j;
             j += size;
        }
    }
    return chunkedArray;
}

var a = [123,234,3,4,5,6,7,8,9];

chunk(a,2);

array_compact.js

function compact(arr) {
    if(!Array.isArray(arr)) {
        throw new TypeError("Input is not an array");
    }
    var op = arr.filter(function(val,ind,arr){
        return !!val;    
    });
    return op;
}

var a = [0, 1, false, 2, '', 3];

compact(a);

array_concat.js

function array_concat(arr) {
    if(!Array.isArray(arr)) {
        throw new TypeError("Input is not an array");
    }
    
    var argArr = Array.prototype.slice.call(arguments);
    argArr = argArr.slice(1);
    
    return arr.concat(argArr);
}

var a = [123,234,3,4,5,6,7,8,9];

array_concat(a,1,2,3,[4],[[5]]);

array_fill.js

function array_fill(arr,value,start,end) {
    if(!Array.isArray(arr)) {
        throw new TypeError("Input is not an array");
    }
    start = start || 0;
    end = end || arr.length;
    
    while(start < end) {
        arr[start] = value;
        start++;
    }
    
    return arr;
   
}

var a = [123,234,3,4,5,6,7,8,9];

array_fill(a,1,2,3);

array_unique.js

function unique(arr) {
    if(!Array.isArray(arr)) {
        throw new TypeError("Input is not an array");
    }
    var uq = [];
    var i = 0;
    for(i = 0; i < arr.length; i++) {
        uq.indexOf(arr[i]) == -1 && uq.push(arr[i])
    }
    return uq;
}

var a = [1,2,3,4,4,5,6,6,7];

unique(a);

array_unique_2.js

function unique(arr) {
    if(!Array.isArray(arr)) {
        throw new TypeError("Input is not an array");
    }
    var uq = arr.filter(function(val,ind,arr){
        return ind == arr.lastIndexOf(val);    
    });
    return uq;
}

var a = [1,2,3,4,4,5,6,6,7];

unique(a);